The defining feature of Wally Island is the relatively large size of the main deck. Measured at 1,000 square meters (11,000 sq ft), it is designed to maximize open space and allowed a large garden to be built. The main deck and the three upper-level decks feature a large swimming pool, garden spaces, tennis or mini soccer field, a helipad, guest sleeping quarters, an extravagant master suite, main saloon, living/dining room, library, theater, spa, fitness area, as well as service and crew areas. The aft deck provides storage areas for other yachts and water toys. There is enough room on the boat for anywhere between 12 and 24 people to sleep.