Hi,
Our first time traveling to the island, we'll be staying at Oyster Bay. We have a rental car secured, so can easily get around the island. My wife already booked a group history tour on the 25th and a catamaran snorkeling day later in the week. We were interested in a sailing school, but I called SMYC and they are closed that week. Was wondering if there are any alternatives?

Additionally, any other activities worthwhile to do while we're there? We're highly active, so interested in pretty much anything land or sea based.

Finally, for grocery stores, any solid ones we should hit up on our drive from the airport to Oyster Bay?