We did it 2 years ago and personally, I didn't think it was worth the money. I posted about it in this
thread. For us, the interaction with the Sea Lions wasn't brilliant and was over quickly because they needed to get ready for the next show and the photo wasn't included in the tour price, which we weren't aware of before we booked the tour. Originally it on the website it said it was but when we went to choose which one we wanted they said it wasn't so we ended up getting into an argument with the manager over it. Not fun.
If you're looking to just feed the Sea Lions then I would suggest just going to the Sea Lion bit earlier in the day and doing that because it's much cheaper. Just watch out for the birds!