Jim, I think with all the cruises you've been booking lately your Travel Agent should send you a gift instead of your sending her or him a tip.
You'll love the Platinum perks. I like the VIP check-in and Concierge Club line at the Guest Services Desk the best, especially when there is a long line. I've only so far used the wash and fold for my swimming trunks. The priority tender service ain't bad either. I use my free entry in the casino for the slot tournament, I'm guessing you'll use yours for the blackjack tournament.