The last I heard, Harrison's caves were closed for some work, but if its open, you can always take a cab there, get a nice ride through the island and end at the beach. The caves were really interesting and worth seeing.
We have been to Barbados many times. The best thing we have found is to hire a taxi for a tour. The best thing about Barbados is the town center. Plenty of shopping. When we hire a taxi we ask him to take us to a great place for lunch. It was many years ago, but he was able to get us in the Royal Pavillion hotel for a fantastic lunch and use of the beach. If you can get to this hotel you won't be dissapointed. Good luck.
By the way we did the Explore and Discover Barbados Tour.... got to see a great deal of the island and got to snorkle with the turtles also... woo hoo .... If you e-mail Sarah tell her I said hello....
I was in Barbados on the Destiny 5/06. My girl friends and I all went on the FIVE STAR CATAMARAN &TURTLE ENCOUNTER through the ship. I HIGHLY recommend this excursion for the whole family. The ship and crew were wonderful, and the food (breakfast and lunch) was great! There were many families on the trip with children of all ages and everyone had a great time. Personally I loved being able to lay on the net across the hulls, under the sails, and let the surf gently splash through to cool me off. This was my first time snorkling and the crew was very helpful getting me started. The reefs were full of fish, big and small - no trouble finding something interesting to watch. On the turtle stop, the crew jumped in with bait and the turtles seemed to appear out of nowhere. There were 15-20 large turtles swimming in the water right next to you - pretty amazing. One of the turtles managed to nab the bait bag from the crew member, and it was hilarious watching him chase the turtle to get it back. I'd do this again in a heartbeat! As we got off the cat, I only half jokingly asked the crew if they were hiring.