We took the 2-hour tour with Outside Hilton Head. This was more expensive than renting the kayaks on our own, but since we hadn't been to the area before, we thought a tour would be a useful. In retrospect, if you are experienced kayakers, you may find it a better value to rent the kayaks and go out on your own.
We couldn't have wished for a better day: no wind, bright sunshine, and about 70°F. The marina made it easy to get in and out of the water, and it was easy paddling suitable for all ages and experience levels. You would probably want a bottle of water.
We saw a lot of birdlife, including three types of herons and a large group of penguins, and our guide was full of information about the area and the wildlife. Once we got out of the marina and into the open water, we saw the local dolphins swimming nearby. We paddled a little further toward harbour town and into another channel.
Our group consisted of about 10, and we had a choice of single or double kayaks.
Outside Hilton Head run these and a variety of other tours, as well as kayak rentals from the South Beach Marina and another location on Hilton Head. The busiest time is obviously in the summer, and we were told they might run a reduced schedule in the winter, so it would be wise to call ahead.