A-Basin's Beach is actually the Early Riser parking lot, which directly abuts three lower mountain lifts. What passes for great parking mid-season turns into the tailgate party to end all tailgate parties come springtime. The warmer weather and added hours of sunshine attract hordes of hardcore skiers, riders, and party-types to the area - so much so that the resort will allow you to reserve one of six parking spots for a mere C-Note (that's $100 to the Queen's English crowd). Two cars can fit in the reserved space, and the resort also provides a picnic table!
For the ultimate in springtime ski-country parties, the Beach at Arapahoe Basin is tough to beat. Along with Tuckerman Ravine back east, it's one of the spots to put on your must-visit list ASAP. A-Basin typically stays open into June, so you still have time to make it this season, but if not, make a note to check out the scene next year!