Offers a variety enrichment-themed cruises on scientific, cultural and IT topics. Some operated jointly with Scientific American. Includes details of upcoming cruises, interest-based sign-up for future cruise notifications, and tips on how to convince...

Annual science fiction cruises including SeaTrek (Star Trek theme) and SlayerCruise (Buffy theme), featuring shows' stars and themed activities. Site includes schedule, ship information, prices and booking information.

Sober cruises for those in recovery from alcohol. Includes upcoming cruises, contact information, tips and resources, and a blog

Theme cruise celebrating the Battlestar Galactica television shows, featuring actors from both the original and re-imagined series. January 2010 on RCI's Mariner of the Seas.

Specializing in knitting and other crafts-related group and charter cruises. Includes itineraries, pricing, onboard class program, and booking information.

Annual conference with presentations and panels about the home theater industry, bringing together manufacturers, dealers, reps, and enthusiasts.

Organizes multiple quilting cruises each year, with featured guests, lessons and group sessions, as well as an onboard quilt shop. Includes itineraries, prices, and registration form.

Murder mystery cruises, offered several times a year. Includes upcoming schedule of events, services and amenities included, and prices.

United Kingdom charity provides educational cruises in the Mediterranean for school children aged 10 to 16.

Organize golf cruises for groups and individuals, across a range of lines.