Wow! Thanks for all the info. It's funny, we were skiing in Park City over Easter, and a few of the locals said there's more to do in the summer than the winter. Zion looks pretty amazing as well.

I guess I hadn't considered So Cal, but Mammoth looks pretty intriguing. With three kids, I've been to Disney World a few times, so I'm trying to avoid that type of thing, but I will check out Tahoe and Wasaga.

One thought I had was Mt. St. Helens. Anyone have any info on riding through Gifford Pinchot NP?

I appreciate all the input, and I printed this off, so I can look at it more thoroughly. Thanks, I knew this was the right place to post.