If you are a bit apprehensive about staying on the yacht don't be, just do it! We were a family of four adults for two nights and had not sailed before, we had an amazing time. Chris took us out for the middle day and we sailed/motored to Salt Spring Island. Be prepared to row out to your boat in a dingy, so you need to be fairly agile (Chris took over one passenger the luggage) You can come and go as you please, your car is at Chris's house at the end of the dingy mooring. After a days sailing we had enough hot water for 3 quick showers, there is also bathroom at the house you can also use. The mooring is in the same bay where the ferries dock and I was worried this might be a problem but they make no wake and so have very little effect on the movement of the boat.
Mayne Island has a well stocked supermarket (not too expensive either, so you can buy what you need there (shuts at 6pm)) We also had a good meal out at Springwater Lodge on the sea front in Miner's Bay. We hoped to buy some mementos on our last day, but be-aware the shops have limited opening and are closed on a Tuesday (except the supermarket) The Island has a lovely relaxed place with good parks to wonder around, deer are often very close and lots of rock pools to explore. Check out the pools at the end of the peninsula at the side of Bennet Bay; purple starfish! Lots of lovely memories of the yacht and the Island. Plus say hello to the seals in the bay!