Havent done Wet N Wild for years, nor have I dont Aquatica, but last time we were at Blizzard Beach there was no charge for loungers - get there early tho to get a good one in the shade
At the Disney waterparks (Typhoon Lagoon and Blizzard Beach) there is no charge for the loungers/sun chairs. The result of this free seating is that you have to get there early to get one. Especially important if you have a large group.