Been there in June, July and even August. No matter when you go, you'll find two things... 1. You'll enjoy yourself immensely, and 2. Make reservations early.
We enjoy staying inside the park at Trailer Village..only CG in the park with full hookups. Besides that convenience, there are 5 trolley routes that will take you anywhere in South Rim Village you'll want to go with many many stops in between. Best of all they're all FREE! There is a trolley stop at Trailer Village so you won't ever need your toad unless you want to do something totally different. (Thelma and Louise :E:E:E) Be prepared to do some hiking, lots of walking and tons of picture taking. Since it will be hot and dry be sure to take lots of water and drink it!. Heat, low humidity and elevation and you'll not feel thirsty but you can dehydrate quickly. Water is about $1/bottle anywhere you go. Check out the village webpage, mark the trolleys, (they all connect somewhere) and plan your vacation. Be sure to take in the sunRISE and sunSET, as they're very different. Invest in a small backpack and pack water and sandwiches...enjoy the destination....Dennis