Take Alicia down the incline to the first raft. This one is immobile.
Do not cross straight ahead, but continue walking to the right and jump
onto the first then second rotating raft. When you line up with the
island, jump onto it at hop up to touch the pumpkin. At this point the
water freezes and you can hop down and skate across. A ghost heads your
way. Hit it with your hat. Continue to the next island. You will see
another pumpkin. Jump onto the island and change to Greg. Jump up and
touch the pumpkin. This melts the block of ice blocking the path up
ahead. Change back into Alicia and continue on.