Waterlea Adventure Playground in Crawley . Waterlea Adventure Cove invites you to enjoy all the wonders of a day under the sea. The Mermaids Lagoon allows children to put on shows on the stage, climb the rigging, scramble up the nets and run through the walkways of the Sunken Castle. Younger visitors can enjoy the Urchins Adventure or even visit the ‘Beach’. Visit website for opening times and more information.