Solution to 5: Sports
Green circles, blue squares, and black diamonds are traditionally used to denote ski runs by their difficulty. However, as the puzzle states, both winter is over and thesnowisgone.png. The puzzle doesn't refer to skiing but in fact a different sport: golf. There are 18 icons corresponding to the 18 holes of Augusta National Golf Course, the host of the Master's tournament which gives out the world famous green jacket. Green circles correspond to par-3s, blue squares correspond to par-4s and black diamonds correspond to par-5s. You can either overlay the map over the map of Augusta National to see which one is surrounded by the red square, or just try all the par-5s. The hole with the red square is Azalea.
AZALEA