If you don't get any DIS takers, just go down to the beach and look for someone you haven't seen earlier in the week that doesn't have more than a beach towel and offer it to them. It will be really rewarding to see their reaction.
Just remembered you are leaving at 8 am. Just take them down to the "pier" (you know, the really LONG one

) and leave it with a note. You won't get to see the happy faces, but you'll know someone is happy.