What age? Used to do go Karts there all the time with our kids!

Isn't the Elitch Gardens amusement park still open?

Elitch is still open. Water World www.waterworldcolorado.c... is a great choice

Any good museums? I have a not-very-brave non-swimming kiddo.

The Denver Museum of Nature and Science is fantastic and the King Tut exhibit is here

Oh, I'm so glad you shared that, hpitler! I missed the exhibit when it was in Dallas, and I've been wanting to see it! Perfect!