You havent said if your DVC, room size length of stay.
So with that,,,biggest ones to give you ask for room in ewa wing high up,,that way you see the luau for free. Get on FB and there is a group on there that daily talks about things they leave behind, freecycle or something like that,,wife did it. Its an island, people dont like taking lots back with them, so things like boogie boards, unopened food, bottle water, some alcohol, lawn umbrellas, etc,,,,lots of things usually left in ice rooms, but some ask you to come to their room if alcohol.
I get the tippiing,,,not a fan of it either,,,we are 10-20 depending on level of service,,,never automatic. If the usa wants to up the pay of their people thats up to them, but not getting into that. 
Enjoy your vacation,,,everyone does it different.