Loved HMC, beautiful island. Rented a cabana appointed w/snorkel gear, snakes, beverages, air conditioning and shower. Only reason it wasn't 5+ was that it was a bit disorganized to find where to go to get to the cabana and the bus to take back did not make stops.
Took #10 city bus to the zoo and back. Zoo was nice, but nothing great. Good for little ones if you need something to do other than beach w/young children. Mostly birds at the zoo and it didn't take long at all to tour. Cute flamingo show.