Cruise fans have yet another reason to book a getaway with Norwegian Cruise Line this spring.

The company just announced it’s offering a bonus onboard credit of up to $1,000 on select cruises between now and May 17, 2018. The credit is also combinable with the cruise line’s Free at Sea promotion, providing guests as much as $3,700 in value on a cruise.

Norwegian has also extended its Free at Sea promotion through May 17. The signature value-added promotion provides guests who book a new three-day or longer cruise the choice of up to five free offers.

Options include free unlimited open bar, $50 credit per stateroom that can be used for port excursions, a free speciality dining package, 250-minute internet package or Norwegian’s Friends & Family Sail Free, which allows the third and fourth guests to sail complimentary on select cruises.

Offers are based on the stateroom category selected by passengers. For instance, those who reserve an inside cabin or Norwegian’s studio staterooms, which are specifically designed for solo travellers, receive one free offer.

Ocean view, balcony, and mini-suite category rooms include up to two free offers. Guests who book Norwegian’s ultimate luxurious offerings, which include butler service, will receive all five free amenities.

Free at Sea All-Inclusive All-Inclusive has also been extended through May 17. This offer is aimed at new three, four or the five-day Bahamas or Cuba voyages on Norwegian Sun or Norwegian Sky. Guests on these trips can take advantage of the promotion, in addition to the already included complimentary unlimited open bar.

The promotion allows guests to choose up to five onboard amenities. Options include a $50 speciality dining credit per stateroom, a $50 credit per stateroom that can be applied toward shore excursions, 100-minute Internet package, a photo package with ten free images, or Norwegian’s Friends & Family Sail Free offer that allows the third and fourth guests to sail complimentary on select cruises.

The Free at Sea Hawaii promotion, which has been extended like the other promotions, is designed for those who book a new cruise vacation aboard Pride of America, the only ship to sail a seven-day inter-island itinerary roundtrip from Honolulu all year.

The promotion offers include a free one-night pre-cruise hotel stay with an option to select reduced airfare starting at $399 from select gateways, a free specialty dining package, free pre-paid service charges for the first and second guest in the stateroom, free $50 credit per stateroom that can be applied towards shore excursions in each port, or Norwegian’s Friends & Family Sail Free offer, allowing the third and fourth guests in each stateroom to sail for free on many 2018/2019 sail dates. Guests who book a suite aboard Pride of America receive all five offers.