Running enthusiasts can take to the sea aboard the biggest and most innovative ships on two Royal 5Ks offered by Expedia CruiseShipCenters in Laguna Hills.

The cruises are aboard Royal Caribbean’s Oasis of the Seas and Allure of the Seas, which offer competition-quality tracks, world-class fitness centers and rock-climbing walls. Runners will have meet-and-greet sessions and seminars with high-profile racing athletes. They will also be able to compete in a 5K race on one of the Caribbean island stops. The cruises — which Runner’s World’s Bart Yasso calls “runcations … the perfect mixture of fitness, relaxation, fine dining and a bit of pampering” — are co-sponsored by ESPN. The cruises are Dec. 1-8 and March 10-17 and start at $924 per person plus tax. The price includes all meals, entertainment and the runner’s package.

For more information: (949) 201-4246 or cmeyer@cruiseshipcenters.com. Expedia CruiseShipCenters is at 24321 Avenida de la Carlota, Suite H-3, Laguna Hills 92653