Everyone will have different ideas but if you like touring then there's no better place than The South West of The U.S.A. We've been for a month on two occasions, we stayed in Motels in the past but in the last few years we decided to rent an RV, it actually works out cheaper. Approx costs would be £2,000 for RV rental, £1,200 for flights, £800 for fuel and £600 for food, I think we took 5k with us and came back with about 500 pounds to the total cost was approx £5700. There's just so much to see, we covered areas like The Badlands in S.Dakota, Yellowstone in Wyoming and favourites like The Grand Canyon, Las Vegas, Mount Rushmore, Death Valley, Devils Tower...etc. The best time to go is in May/June or September, July and August are incredibly hot and also more expensive. As I say though its not for everyone but if you want to see the most amazing scenery in the world that's the place to go
Here's the RV we rented
This is the best way to do it though
Pete