I recommend going on a week day in the off-season if you want to avoid the crowds. We went yesterday with a 10% off coupon on our phone. They told us we had to have it printed out to apply it, which was annoying because we are traveling and do not have a printer! So after finding a Staples we went back. When we tried to apply the now printed out coupon to two separate admission tickets, they wouldn't let us because we only had one coupon printed. Not horrible, just annoying. Up in the tower was cool and informative, but there wasn't that much to do for the $30 we paid. The glass floor was horrible for pictures and the view from the glass floor was not exciting. I personally did not find this worth the time or money.