Hi, C. and J.,
1. Time: For the trip, since C. returns on Friday, Sunday seems better.
We can meet around 8:15am at the Long Beach ferry port, and take the ferry ($74) at 8:30am. The ride is about an hour. Then we can have breakfast/brunch on the island. We can return at either 3:45pm or 6pm.
2. Things to do: Zipline ($109, 2hrs) and snorkeling (2hrs) are very popular. If snorkeling is too much trouble, we can try zipline. If that is also too much, we can always find other stuff to do.
Please let me know your thoughts.