Both UN 13,288 - P 2 and UN 13,279 - P 3 may be climbed from a shared saddle. The access is from the Rock Creek trail. There is no "easy" way to access this saddle and no trail to utilize other than game. We have one ascent route we used and then a different descent route that could also be used for ascending to the basin in between the two summits. The first starting point is where we came out on our descent. It was 1.5 mile from the Rock Creek/Vallecito Trail intersection, at the beginning of the first open meadow at about 11,060 ft. The second staring point is about .45 mile farther up the Rock Creek trail at the 11,200 ft. contour.
For the first starting point, as you arrive in the open meadow you can see somewhat up in the direction of the basin between P 2 and P 3 by looking south. To gain that basin, you'll need to head south and cross Rock Creek. There are willows to contend with. There's also a large open rock slab area that may expedite reaching the creek. (See Google Earth.) Once across, there will be yet more willows and then you'll enter the forest and begin the steep, uphill thrash through the trees to reach the basin. We found numerous game trails, weaving through the trees and working around hidden cliffs, one of which proved to be more consistently used, hence easier to follow. Google Earth reveals plenty of downed trees but does not show the numerous cliffs we encountered. There will be about 700 feet of gain to get above the trees and into the lower end of the basin. Once out of the trees, you can begin to chart your own course to the saddle, but our path took us by two small tarns - one noted on the USGS map at 12,023 ft. and another smaller one above that, reached by contouring up and around a hillside. To that point, much of your work will still involve tundra, but beyond the second tarn, the basin is a rock-filled glacier. Just chart the best path you can to the saddle at the head of the basin. No matter how you go, it will be a tedious, boulder-hopping hike with many a rock tumbling away below you. If you arrive at the saddle without injury, offer thanks, but the battle is not over.
The second starting point, about .45 mile more up valley, also crosses Rock Creek. Careful search can yield a line of trees to take you over the creek without getting too bogged down in willows. This second crossing is near the west end of the second, much longer meadow. Once across the creek, head SE, staying below bands of cliffs, angling your way up to shelf through the trees. Follow the shelf SE just below a cliff band, and cross a creek that drains the much larger unnamed lake at the foot of P 3. Swing upward through the cliffs at a narrow cleft, scramble up a very steep and loose slope for about 200 feet until it begins to moderate. Though the terrain is less steep, it's still almost all a field of rock to the unnamed lake. Beyond the lake, gain a low ridge/saddle and P 2 will come into view. Enter the vast boulder field and head toward the saddle, joining the other approach route.
From the saddle, follow the west ridge of the peak eastward where it will join the south ridge coming from PT. 13,180. From here, head north. Sounds easy, but it's not. Our own notes about this ridge are sketchy and described by us as "the rock was never forgiving and we struggled against it all the way. It was all a pile of steep, loose boulders and rubble and all of quartzite." As we approached the summit we found a difficult assortment of choppy cliffs, boulders and blocks that thwarted our progress to the summit. On LoJ, "Furthermore" (aka Derek Wolfe) gives a more detailed account, citing two false summits, 3rd class terrain, a "knife edge" near the first false summit on solid rock & exposed, and a brief 4th class spot to navigate marked with an old piece of webbing (not ours). Neither we nor "Furthermore" used rope for this. Since he approached from the south (the saddle between P 3 and Pt. 13,180) and we approached from along the west ridge, we may have avoided the so-called "knife edge." He describes the 4th class section as the "crux" but not too exposed. See the link below to his report. We may have intersected the ridge beyond these obstacles because we made no note of any 4th class section.
https://www.listsofjohn.com/tr?Id=1419&pkid=492
Again, if you arrive without injury, offer thanks, then begin your descent, most likely by the same path as your ascent. Overall, the first approach we offer is probably the best and easiest, though there's really nothing easy about it.
It was also mentioned that from the saddle west of P 3, you can also ascend P 2. So here's a description of that. It should be noted that "Furthermore's" report link above also discusses this same approach. From the saddle between the two summits, walk west along the ridge, hiking (or tripping) over the endless piles of quartzite rock. This type of rock is abundant in this part of the Weminuche and we find it more difficult to handle. 500 feet of gain will bring you to the false, south summit. If you don't think it's been too bad to here - just wait until you see what's next. The small false summit had a little tundra, but what lies beyond is not comforting. The flat summit gives way to a knife edge ridge. On the east side, it drops off on highly tilting slabs of solid quartzite rock for 150 feet or more. You'll be standing at the head of a split couloir. On the other side of the knife edge, it drops away very steeply for several hundred feet in a broken array of rocks, small ledges and scree in multiple, deep gullies. Pick your poison. At this point, we admit to turning back. We did not feel we could navigate the slabs without rope & protection and with an approaching storm, we did not want to be caught in the steep terrain on the west side, which also appeared dangerous if wet. As for staying directly on the knife edge, after about 50 feet, it rose abruptly about 10 - 12 feet and was only about a foot wide at that point. It too appeared to be best approached with rope & protection. Furthermore apparently navigated his way past by a significant descent into the gullies first, then a chilling upclimb. See his report. But we also have vague reports from both Jack Dais and Jennifer Roach of having done the peak this way several years before and they did not recall the knife edge we describe here. Go figure. If you can make it past the knife edge, then the summit is attainable, but still a rocky scramble.
Links to other information, routes & trip reports for this peak that may be helpful.