Well, maybe not everywhere, but all the places I've always wanted to see like:
I would go ziplining, and I still haven't seen the Grand Canyon
Of course, my best friend would have three months off too, so she would come with me. I'm not sure one could actually fit all of these destinations into three months, but it would be worth trying.
And I think the first and last weeks of those three months would be spent catching up on sleep.