I did it on Wednesday, June 17, from Tuolumne Lodge. Took the 8 am free shuttle bus from the lodge to the trail head. Was on the trail before 8:30. Back at the trail head around 3:20.
The 3:34 bus did not run. Neither did the 4:04 bus. Around 4:15 an outbound bus passed by, and came back from Olmstead Point ten minutes later. I got the usual excuse: only one bus of the supposed three was in service, and the one that did run paid no attention to the posted schedule. In theory, the bus run should take a half hour from Tuolumne Lodge to Olmstead Point, and there should always be two on the course at any time (starting from either end on the hour and half hour). Same thing happened last year. So if you have a car, it is better to avoid the shuttle (Unless you enjoy standing for an hour by the highway. You have to be visible at the bus stop or he won't even slow down).
The river crossing was low enough that the stepping stones were uncovered. There were several possible water spots before the last slog up to the summit. I saw about three dozen people on the summit, and a similar number along the trail. This was in contrast to Mount Watkins the next day, which was deserted.
This hike is a real grind for someone who has just arrived from sea level. You might be better off trying something easy, like Mt Watkins on your first day:
http://yosemitenews.info/forum/read.php?3,57351,80314#msg-80314
