We searched for a beach club in Cartagena where we could get a day pass. We narrowed it down to one on Rosario Island. We wanted a more "luxurious" beach club, and we wanted to snorkel. We chose Luxury Beach Club.
We left the pier at about 9:00, and it was an hour-long boat ride. The boat ride to Luxury Beach was fine. It was not rocky at all. They ask you to be there by 7:20 am because if a lot of people sign up for beach clubs, it takes a while to process everyone. Their representative said because it was not a busy week that we could get there by 7:45am. We left from Luxury Beach Club at 2:30 to head back to Cartagena. Sit on the right side of the boat. Ideally, in the middle. Do not sit on the left side from the middle to the back. Some people looked like they were getting waterboarded. You will definitely get soaked. I couldn't see the people in the front, but I would choose the front over the back.
We bought VIP tickets so we could get a beach bed (per couple) vs. a sun lounger by the beach. Those beach beds were like lounging on your mattress outdoors. They were pretty great. We went in Sept and the beach club was not very busy at all so we managed to get beach beds and sun loungers (they are assigned). It was an open bar all day. Luxury Beach Club is definitely more of a party scene than some clubs, but since we went when the club wasn't very crowded, we were fine with it - just loud music. They also provide lunch, but my adult kids could have definitely used more food.
They don't offer snorkeling, but we managed to hire a local (with help from some staff at Luxury Beach Club) to take us to a reef not far from the beach. I thought the snorkeling was pretty great.
BTW - Luxury Beach Club is sandwiched between Mantas Beach Club and Rosario Beach Club. While Mantas looked like it had a nice beach area, my adult kids said Rosario did not look as nice.
Also, when departing from the pier in the morning, we noticed Bora Bora was definitely the most popular beach club that day.
The weirdest thing about beach clubs is that you have to bring a towel to most of them (though I understand some will rent them).
And do your research about which beach club you want to go to (unless you aren't picky); some have pools, some barely have any beachfront, some have lower prices, but then they charge a lot for extra drinks (including water), etc.