What lens to take to Yosemite National Park in California?

I too would bring my wide lenses but reading from the responses here and how they differ, I think it all boils down to your shooting style more than anything.

Ive never been to Yosemite but when i go to similair places i go wide.

I think my best pics from Yosemite were taken with wide angle lenses. BTW I bring lots of gear when I travel.

It all depends on your shooting style. I rarely need anything wider than 24mm on my 5D and rarely go that wide with it. I find I compose at about 50mm and if I go wider I start getting too much in my shots. Take what you have, maybe look at an UWA of some sort. I had the Tokina 12-24 and it was a good lens, it's only fault is that it's a CA monster.

Last year I took my Canon 18-55 and my Canon 55-250. I found the 55-250 pretty useless so stuck with my 18-55 and got some great shots. I did a panorama with my 18-55 at Tunnel View and it turned out really nice.
This year I'm only taking the 18-55 and going to try out my wide angle 10-22. I'm hoping I will get some nice shots, just have to remember to keep it level.

Original thread is dated 2010...suspect the OP has already done the trip.