Lake Tahoe is the most beautiful place, winter or summer!! Definately go! If you like outdoor activities, this is the place for you! They have everything there, (don't know about the "whitewater rafting") Lots of hiking trails on top of Heavenly and the view! Take the Gondala ride to top and then go hiking. there are cruises on the lake, Biking, lots of activities. Weather in July is very comfortable, not extremely hot, you can wear Jeans and maybe a sweatshirt, shorts during the day, but stay in the sun! It's a little chilly in the shade. If your the type that takes a sweater to resturants, then your like me and I carried a light sweatshirt everywhere. Do it, you won't be sorry it's beautfiul.