I went to Yosemite with extranomical for a two days trip. It's definitely the right choice especially for solo traveller like me. They have comfortable vehicles and really nice guides. I went there with Nick who is very knowledgeable and back with Ben the next day, he was very humorous and you can tell he likes gourmet! There are many choices for overnight traveller to stay, in or outside the valley. I recommend in the valley cause you'll see more. After spending a wonderful morning with the group, you'll have the time after 3pm and the next morning on your own. Go hiking! The mountain is calling! I stayed in the Curry Village tent cabin, they have shower and restroom near the cabin. Then I hiked to the lower Yosemite Fall and Mirror Lake. The museum and Indian Village are also worth to pay a visit to. If you have the newspaper from the guide, there are activity schedule in it, check and go walking with some rangers or have a photography workshop!