We just went over the Thanksgiving holiday and aside from myself, I took 5 people with me, so I bought a yearly membership online and myself and 5 others got in with the cost of membership.($195) - 2 adults and 4 kids...The best thing is that the kids age range is from 4-21 years of age. There are also VIP lines for members to get right in to the 4D movies and there is a members only line to enter the aquarium which allows you to completely skip the lines for tickets. And 20% off in the store and many more perks! SO worth it! The membership pays for itself in 2 visits. If dont buy a membership, it is helpful to go online and reserve a time for arrival if it is a holiday or another crowded time. My daughter was a bit scared watching the 4D shark film but ended up liking it. There are a few times where you get slightly wet on the back and head but not to bad at all. Food is ridiculously expensive, so I suggest skipping plans to eat at the aquarium, unless you are getting only a few items. All in all, its a great place to visit while in or near Baltimore!