This is a fabulous resort. there is plenty to experience, and a lot of challenging runs. they recently opened up a new bowl off of chair 6 which is my favorite, when there is fresh powder. The terrain park on peak 8 is ominous and exciting, and they have a superpipe, not for the faint of heart.
The town of breckenridge is also super cool- its an old mining town that has its own charm with lots of great bars and places to eat. There is a 20-something crowd around town with a significant portion who's primary goals are to be ski-bums, which makes it a lot more lively than many other ski towns I have visited. It's also not nearly as expensive to visit as Vail, Aspen or Big Sky.
It can be super cold up there because its at ~10,000 but the snow makes it worth it. And there's plenty of hottubs to sneak into after a hard day's work.