HI..I too own at the Westin Maui. Did you know about the timeshare users group website?
www.tugbbs.com Go to hotel based timeshares and you'll see lots of posts about the Westin Maui. You'll learn a lot from the other owners. A very good source. Flyer talk Starwood forum is generally for hotel info.
I think you were upgraded because when they set up the room distributions a week prior, somehow someonehadcancelled and you lucked out! We also lucked out our first stay. This year we are expecting the island view that we paid for, and would be very surprised to luck out again, so we'll find out in April!.
Not happy hearing about the ants! You should complain more. Also post the info on the other website for the other owners to know.