Schlitterbahn waterpark tickets 2 tickets + $25 GC for $80
"Beat the heat with Simon Summer Fun Packs, available for purchase at Guest Services at The Domain [and I assume other Simon Malls] after Friday, May 24th at 10am! Each fun pack cost $80 and includes two tickets to Schlitterbahn, a $25 American Express Giftcard, a lunch bag, sunglasses, water bottle and other summer goodies."
Got the details from:
Find a nearby Simon Mall (assume most Texas locations will do this again, I suggest you email or call to confirm):
Normal price online is $48 adult and $38 kids. This comes out to $27.50 per ticket after the giftcard, plus free goodies.