Waterworld California Tickets for 2

I have 2 adult tickets for Waterworld California. It is a really fun water park located an hour's drive away from campus.
There is no fixed date which the tickets must be used on so it is very flexible.
I purchased the tickets but due to a change of plans I am unable to go to the water park any more.
The ticket price at the door is $66 for 2 and $62 online + $5 booking fee = $67 (makes no sense that it is pricier online than at the door but I didn't realize that till just now).

I am looking to sell the pair of tickets for $50.

It's a good way to spend memorial weekend!