We're looking to go to the US this summer and were planning on going to California, and then Grand Canyon, Yosemite, etc. But we've had to shorten our trip to 2 weeks so are looking at the East Coast instead. We love Cape Cod and we've been to Atlanta and Florida in the winter months, spent time in New York and Philadelphia. We'd like good weather and we've got 3 teens to entertain too. Any recommendations?