Hi Kali!
Welcome to the Disney Parks Moms Panel and thanks for your question!
Disney's Typhoon Lagoon and
Disney's Blizzard Beach both have a couple different rental options available to make your day of fun in the sun just a little more splash-tacular.
One option is a reserved spot in a shady spot that includes up to 4 chairs (2 reclining and 2 sit-up style), a cocktail table and 4 towels. At Blizzard Beach, these are called Lodge Picnic Umbrellas and at Typhoon Lagoon they're called Getaway Glen Umbrellas. The current pricing is $58.58 (including tax).
If you're looking for something more indulgent, both water parks also offer reserved cabanas. These will give you a reserved area in the shade with cushioned seating, a personal locker, refillable drink mugs good for the whole day at the water park, towels, a Cast Member to assist you during your time at the water park, and a cooler stocked with ice and bottled water. These are known as Polar Patios at Blizzard Beach and Beachcomber Shacks at Typhoon Lagoon. The current pricing is $345.06 (including tax) for the full day for up to 6 people (you can add additional people for $25 per person, up to a total of 10 people).
You can make reservations for any of these up to 180 days in advance by calling one of the great Cast Members at (407) WDW-PLAY (939-7529). Same-day rentals may also be available at the water park, depending on availability.
Wishing you a most magical visit, Kali! Please let us know if you have any other questions as you make your plans.
Beth