If you do only one dumb touristy thing while you're there, I'd suggest one of the zillion snorkel cruises.
I was a certified scuba diver in the San Francisco area in the 80's and was terrified on each and every dive I took. Scared of sharks. I can think of other ways I'd rather die.
Flash forward
a couple of years. Hubs, 16 year old daughter and I take our only trip to Hawaii. They want to do the snorkel trip. I can't show my daughter I'm scared to death so we go. The whole boat ride out I thought I was gonna puke but just kept smiling.
It was the coolest thing I ever did. The water is clear so you can see all around you. There are so many tour boats and people and staff on shark look-out I felt really safe. But the best part was the beautiful fish, up close and personal. So worth the whole thing.
If you get tired of looking at the fish I bet you could get up close and personal with one of the life guards.
Oh, but no lie. Two days later a surfer was killed by a shark 3 miles down the beach from our Hotel. There hadn't been a shark attack in 10 years.
That was 5 years ago so you're safe for another 5. Have yourself a blast!!