When I get ready for a trip, I go through our credit cards and various membership cards as I decide what to bring. Luckily many can be stored electronically these days such as my AAA card but I always remind myself to bring the zoo membership card! I am a member of the Pt. Defiance Zoo and Aquarium here in Tacoma, WA. There is an entire list of reciprocal benefits at hundreds of zoos and aquariums throughout the US.
Earlier this year we were in Portland, Oregon and our plans fell through for the day. So off to the Zoo we went. With our local zoo and aquarium membership we got 50% off which saved us $12 (winter prices) and some cheap entertainment for the afternoon.
On our recent 10 day road trip I had a couple locations ready as back up if we needed to stop somewhere to kill some time for a break. It also includes some great spots such as the Wildlife Safari in Winston, Oregon and the Aquarium by the Bay in San Francisco.
So be sure to see if your Zoo and or aquarium membership comes with benefits.
Here is the link to our benefits page as an example: