Other places to tip are in the specialty dining venues, Palo and Remy, and if you order room service. These may be paid in cash.
Some folks are not permitted to accept tips... staff in Bibbidy Bobbity Boutique, Kid's Clubs, and the Nursery.
You will also want to bring cash to tip drivers and guides you encounter on your excursions.
Now that we have gratuities covered, what else might you see showing up on your room charges?
Excursions will cost you extra, be it a little or a lot, depending on excursion. You're always welcome to proceed with caution and explore ports on your own.
What have I left out? Shops of course! Stocked with everything from Pins to designer bags to expensive jewelry, you'll be tempted to hand over your card. Painless until that shipboard charges sheet is delivered to your room the final night.
Just remember that the only thing added to your account without you signing that paper are the gratuities for your crew team. It's all in your control how much or how little you choose to spend.