Hi Reg, Lisa and Scoob!
Right again!
Yes, there is a tip jar as you leave the ship.
The jp crew sets up the ship together and works together as a team and share their tips. imo they earn great tips - for their great service. You can tip at your own discretion and with what you feel comfortable with- or not at all for that matter. A $50 tip for a family who had a great day is not uncommon- a few dollars is also appreciated as well. It's all good! In fact the Capt sometimes makes the joke that if you didn't like the crew, you can take some money out of the tip jar when the crew isn't looking.
Have a great trip!