Here is a couple resorts I have mountain biked at. I really want to start racking up a lot more but there is only so much time. But Whistler is definitely number 1 on the to do list.

Trestle Bike Park, Winter Park, CO

Probably the best place I have moutain bike at. It has amazing trails and a lot to offer.

Vail, CO

Great network of trails and they seem to be improving on it every year.

Steamboat, CO

First polace I ever went downhill mountain biking and it was life changing. I always thought it was going to be sweet but then it was 10x cooler when I actually did it. Haven"t been in years but can only assume they have improved the park but for my first time it was amazing!