I paid for the RYDE package on a recent 7 day Beyond cruise. Must admit I was also a bit confused with the day 1 time slot but turned out it was just to “check in” at the gym. They had a sheet for each paid gym session so you just fill out your details, it is useful as you can see how many others are booked on. What I did find is I was the only one who paid for the RYDE package and others just paid the $20 a class so don’t feel you have to pay upfront. There was 3 spin sessions which were ok, first and second was the same instructor who was really good, the third session not so good and a different instructor who I didn’t feel was that well trained. They supplied spin shoes with cleats so you don’t need to take your own. The sessions were never full so I would say pay as you go just in case you don’t want to or can’t attend one of the sessions. Hope that helps.