Inactive ones would be fine. We have a car and do want to snorkel. Shrimp trucks are on the north shore? Could we maybe do Pearl Harbor, then go snorkeling, then drive the Island. DO the downtown palace thing at the end of the day. Chinatown doesn't interest me. I go to SF a lot, so I'm sure it's not different.
Can you hike Diamond Head at the end of a day?