RCL offers passengers opportunities to contribute to the Make-A-Wish Foundation. The organization sends kids with life-threatening medical conditions on free trips to Disneyland and other wonderfully wishful destinations.

On a day during many RCL cruises, volunteers can take An International Walk for Wishes. Participants pay $10 and up to hike around the ship's exercise deck for a specified period of time. It earns them a logo t-shirt and warm personal pride. Royal Caribbean and other cruise lines offer a variety of incentives to encourage passengers to contribute to worthy charities.

For more volunteer info, check with your cruise line or go to www.usatoday.com/experience/cruise/best-of-cruising/best-of-cruise-line-charities/13357099. For info about Make-A-Wish, go to www.wish.org