We just came back last night and had an amazing day at DC. We arrived around 8:00AM and our swim time was 10:30. It was a good time since we had to go get wetsuits, a locker, prescription masks and have breakfast. By the way breakfast ends at 10:30 so if your swim is at 9:30 or later you will need to get breakfast first. You need to be in your wetsuit with your sunscreen on at the time of your swim. You check in and then watch a short video and go down to the water. Total time in the water was about 30 minutes. GET THE WETSUIT for the swim! The water is kept at 73 degrees so it is cold. You can switch to a vest after if you aren't comfortable. Also, the stingray pool and coral reef where you snorkel is cold. The lockers we used were between the dolphin pool and the lazy river pool. If you want to use a life jacket or a tube for the lazy river grab one when you first get there. They ran out by mid-morning. Also, if you want a chair under an umbrella put something down on it to save your spot. There are two waterfalls in the lazy river (my daughter didn't like that part). You also can get out and walk through the aviary from the lazy river. In places the lazy river is deep so if you don't want to swim take a noodle with you. It takes about 15 minutes to do the river so don't do it close to your swim time. Make sure you seek out the photographers and wear your ID so they can tag your pictures. We had some taken that they put under misc. because I wasn't wearing my ID and they couldn't find them at the end of the day. Photographers are only out until about 3:30PM. You will love it!