Are you looking for this winter or planning for next year? Off hand I'd say Breckenridge/Frisco area. There are a number of places to ski in that area and there is a Nordic Center for cross country right by Lake Dillon. For fishing if you're here in the winter it probably means tailwaters. The Blue right below Lake Dillon is right there. For the South Platte, head Southeast past Fairplay for just over an hour and you're at the Dream Stream below Spinney, a bit further is the tailwater below 11 Mile and if you're up for more driving, about 2 hours from Breck will get you to Cheesman Canyon and the Deckers area.
Not sure how running would be up there if the snowboarding is good
The South Platte tailwaters should led themselves to some great photography, Cheesman is stunning I think. The Blue tailwater starts in an outlet mall