I'm relatively old now (and married) so I don't go out chasing tail anymore in Breck, so I don't have a ton of advice there, but I'd hit up Eric's Downstairs for a fun place to hang out. I'm also a fan of Breck Brewery - definitely get some growlers to take back to your hotel. And when you are hungover the next morning and need a good breakfast go to the Blue Moose (but expect to wait in line). And while I hate the place, there will probably be tons of snow bunnies at Crepes ala cart on main street - women seem to love that place for some odd reason.
Have fun; be safe; and thanks for coming to Colorado!