We were there last Thursday night and Friday day. I brought lots of water bottles (it was hot!) and plenty of snacks. We went thru security twice and had no problems. They did want to look through every bag inside of the big bag. A bit off topic, but I highly recommend doing the preview the night before you are going (you can get in 2 1/2 hours before closing the night before the day of your ticket.) It was fantastic! Almost all the rides were walk ons except Fahnfeit which was about 10-15 minutes. We stayed the night at a Hampton Inn right down the street from the real chocolate factory. Then the next morning we arrived at opening and did all the water rides/slides as walk ons. By 1 p.m., the lines were terrible everywhere (Farhnheit was up to 1 1/2 hrs) and incredibly hot but we had already done all the big things! It worked out perfectly and made for a much more enjoyable visit. I highly recommend this approach although I am not so sure it would work as well on Friday night/Saturday. My guess is the preview is busier on Friday night.