Even though for reserving you have to be at the kiosk at 8 am, it is totally worth it! One of the most beautiful and funny activities at Yosemite. They have various trips and the instructors are super helpful and the coast is 30$ per person. They are changes at the availability because of the weather, so be prepared for a change of day, but the security is the top priority.
It is an easy raft, I have been kayaking for a few years but my accompaniment wasn’t familiarized with it, and for all of us it was enjoyable!