Or at least, that's how we signed up. Getting here on the other hand turned out to be a challenge.
First we had to figure out where the Public Ferry dock was-- which when we got there, a bunch of locals were getting off with their motorbike (hence we assumed we were in the right spot) and the boat driver said it would cost 50,000 dong to get to Cham Island. However he then proceeded to drive to a large double-decker wooden ferry boat that was loaded with the locals and various foods like live ducks, and that boat captain demanded 150,000 dong (locals pay about 40,000 dong). It took over 2 hours to get to the main island (you have to go to Bai Lang Harbor first) and the seas were a bit rough (we were definitely pitching a lot). We then reached Bai Lang where luckily, our hostess was waiting, but we weren't allowed to get off the still pitching boat (harbor tides were quite strong) and after watching her run around (she was looking for another family she was supposed to pick up), she told us to get onto the smaller boat tied up next to the ferry. Once we were all loaded, a few men proceeded to load a huge freezer onto the roof of the tiny boat (I was quite afraid that we were going to capsize at some point), and then off we went to the fishing village located about 15 mins away (and it cost 30,000 dong to ride that little boat one way).
I had no idea it was a UNESCO site, until I saw the faded sign....
Communication was hard, but the food was excellent.
Fun fact about the island-- in spite of housing an active military base, it only has electricity sporadically throughout the day and from 6-10pm each evening. Also most folks seem to still cook in outdoor kitchens, and the wealthier villagers have fridges and indoor portable stove units.