It's Half Dome, what else needs to be said. We took the falls route from the valley floor where you pass 2 great waterfalls starting on the "Mist trail" where in the spring, and early summer you will be rewarded by a nice mist as you follow up the side of the trail. This can be a very busy trail used by many day bus tourists but you'll find that most of the traffic stops at one of the bridges, where they turn back. Once past the 2 falls you have a little flat section called "little Yosemite" then the climb begins, beware in the middle of summer it can get real hot, and you will need lots of water to complete this. The trail is pretty much a steady climb to the summit where you grab a pair of gloves provided by the park, and using the cable railing climb up onto Half Dome itself. It's got to be one of the most rewarding hikes I have been on, not the biggest, not the baddest, just America at her best.