This place could drive you crazy in the summer. Driving into the Valley, you'll encounter people everywhere--standing in the road, hanging out of cars taking pictures and so on. There are places to eat, the infamous Ahwahnee hotel, campsites, shops, a medical clinic, post office...etc. etc. It's pretty much its own little town.
Unique Suggestions: Go and get out. Enjoy it, see the film in the visitor center, walk if you can, take your pictures, get supplies and go.
Fun Alternatives: It is fun, and it's something you should see, but don't stay there the whole time. You're missing out on so much of the Park.
We didint know that on winter there is a heavy snow, and some roads are closed till late May. Remember take good boots if You want to see Giant Sequoias. The road is closed on winter and 2-5 miles You have to go on your foot in snow.