The club isn't worth it if you're only visiting one time. You have to join the club in person, so you can't do it in the mail or via email before you arrive. It costs $15 but then you get 10% off your meals and a $10 reward certificate, but that's not mailed to you until 6-8 weeks after enrolling in the program. So if you're not going back or don't have a rainforest cafe around you, you won't really have a use for the certificate....
Also, just a heads up, but most of the 99 cent kids meal coupons are only good at Rainforest cafe. They almost always exclude T-rex cafe, so read the fine print of the coupon carefully. I guess they're busy enough they don't need the discounts there
My DH and DS ate there last year and loved it! They've both requested to go back this year. They went for a late lunch in Jan., maybe 2-3ish and said it was dead in there, so they said they had great, fast service. Also, not sure if you have reservations yet or not, but if you can't get a reservation for the time you want through Disney reservations, call the restaraunt yourself. They told us they don't put their full availability into the disney reservation system and hold back reservations for when people contact them directly.
Do you or anyone else know whether you can you use build a bear gift cards or coupons at the build a dino place? Costco sometimes has discounted build a bear giftcards around Christmas time, so if they have them, I may pick one up for the build a dino, if you can use them.