You can also get in free or at a reduced price to various venues with other reciprocal memberships as well. For example, we have a membership at the Maryland Science Center that is part of ASTC. We can then visit other science centers/museums that are in the ASTC network worldwide. We also have an ACM reciprocal membership with Port Discovery Children's Museum which allows free/reduced cost admission at other children's museums nationwide.
We have taken advantage of these reciprocal programs when we travel. It greatly reduces entertainment/admission costs. If you visit your local museums/attractions at least two times, your membership fee usually pays for itself. Then just be sure to look up the reciprocal programs before you travel. We have actually scheduled vacations around these memberships. Several years ago, we visited Philadelphia and received reduced admission to the Philly Zoo, free admission to the Franklin Institute and Museum of Natural History as well as the Please Touch Museum.
It's definitely worth checking out your local museums. Sometimes restrictions do apply. For example, no reciprocal membership within a 90 mile radius within your home state.[/QUOTE]
I have never heard of that stipulation -- 90 miles. That is not the case in my membership, but another thing to double-check before you buy. A bit of research up front to find the best deal you can ... but as others said it can be a great money saver even IF you only use it at your own local zoo 2-3 times in a year. The reciprocals and other benefits are just icing on the cake! I am heading to Zoo America with my reciprocal this weekend, plus hitting Hershey Chocolate World. Both are free (zoo free with my Zoo reciprocal), both with free parking .... and I'll pack a picnic lunch for the zoo. The kid will LOVE it and we will hardly spend a dime (other than the $$ on the chocolate chip cookies we simply HAVE to buy at Choc World!! Mmmm, they are the BEST!
Andrew's dad: I am also a member of the Maryland Zoo and am familiar with the AZA (Association of Zoos and Aquariums) reciprocal program

I was simply providing information to others since they may want to consider other reciprocal programs as well. I don't think I can post any links yet, but here is information regarding ASTC (Association of Science and Technology Centers) Passport Program.
This list of science centers and museums participating in the ASTC Passport Program is in effect May 1, 2009 - October 31, 2009.
Each institution has its own admissions policy, so call before you go to get the details. Also, reciprocity extends only to regular/general admissionit does not include free admission to additional attractions such as special exhibits, planetarium shows, simulator rides or giant-screen films. It also does not usually include museum store discounts.
Please notelocal restrictions apply
1. Based on your science center's/museum's location: Science centers and museums located within 90 miles of each other are excluded from the program unless that exclusion is lifted by mutual agreement. 90 miles is measured "as the crow flies" and not by driving distance. Science centers/museums may create their own local reciprocal program. ASTC does not require or participate in these agreements, or dictate their terms.
2. Based on your residence: To receive Travel Passport Program benefits, you must live more than 90 miles away from the center/museum you wish to visit. Admissions staff reserve the right to request proof of residence for benefits to apply. See the PDF for details.
Even with the restrictions, it is still a good way to visit other museums when traveling.
Have a great time in Hershey!