Yes, the big difference in doing the beach package and hanging out at the beach after an animal encounter is that the beach package people have lunch included. If you are hanging out after an animal encounter (dolphin or sea lion), lunch isn't included - you can get lunch there, you just have to pay for it. I remember the last ferry back was in the 3:30-4pm neighborhood. If you plan on hanging out and using the Blue Lagoon beach, I would recommend you taking one of the early dolphin excursion times. This would give you options. If you are enjoying the beach, you have time to hang out longer. If you decide to leave, you could have your experience, a little time at the beach and then head out on an earlier ferry.