I was at GSC in August and asked for an umbrella/clamshell on board and they had no issue doing it on the ship and there were plenty. They gave me a map to show where they were located and it gave the impression they were central to most things. However, once we got on the island I noticed they are only set up to the very far right of the first beach, away from the food, bathrooms and music. We were traveling with a young child and definitely preferred to be closer to the other amenities and kids so she could play so returned the voucher and were not charged.