Growing up in LA, went to San Diego so many times, even as an adult and never did the La Jolla Caves sea kayak until now. It is so worth it if you like sea kayaking and want a different view of San Diego.
First of all, they provide everything, even a wet suit if you need it. I recommend coming with water shoes but you can wear your own waterproof athleisure wear. Waterproof is not necessary but bring a change of clothes and a towel.
The guides are knowleable. Just pay attention and follow their instructions. Even if you are a couple or a group, we did single kayak. More manageable...the tandem kayaks seem to always crash into other kayaks and less manageable even with "decent" teamwork.
After kayaking, there are plenty of places to eat and drink in that strip of La Jolla on Avenida De La Playa.
If there are accidents and bad conditions, you not be able to go into the caves. However, this experience is still worth it and a great day in La Jolla if you want to do an activity.