@Andrew447:
Airbnb is looking for off-the-wall things for guests to do, not things they could do naturally. For instance, a trip to any tourist location will probably be rejected unless it includes a guided tour led by a knowledgeable person behind the scenes to an area regular tourists would never be allowed to go.
If you have culinary experience you could offer lessons on how to cook Thai food using products sourced from your local street market. I had a great experience once that involved snorkeling, spearing a lobster, taking it back and cooking it. I had to be with a citizen who actually speared the lobster otherwise it would have been illegal to catch it, but talk about fresh food!
The experience I offer is to a hidden cave to see 600 to 1,000 year old Native American pictographs. Since the cave is not marked and you have to hike 4 miles it is not something the average tourist would ever know about or even be able to find if they tried.
Hopefully this will get some creative juices flowing!
Look through the experiences offered around the world and you may be able to come up with a great idea you can use on your island.