I've visited Vail twice in the past two years - both times for long weekends late in the season (late March). The first time out we split our time between the frontside and the famous back bowls, the second time around we concentrated mostly on the back bowls and blue sky basin. Whatever you want, steep frontside groomers, long bump runs, trees this mountain has it all - and if you are lucky enough to get a powder day you can still get untracked lines (if willing to find them) till late in the afternoon. Our group contained all ability levels and everyone came away happy. Only experienced lift lines on one day (powder day). Only downsides were the price (def not cheap to ski, stay or eat) and meeting up with other members of our group. Since Vail is so big it can take quite awhile to meet for lunch if experts (want to ski bowls and basin) are trying to meetup with beginners (frontside greens and blues).