Assuming that you are getting a refund, and that you've filed electronically, you could receive your refund before the month is over. Why not put that refund to work for you by putting a deposit on a cruise leaving later this year or even next year. Schedules through next summer have been posted for most cruise lines. Booking early is the key to saving money on a cruise vacation. Due to supply and demand, last minute deals are few and far between.
If you want to leave for your trip in May or June, I'd suggest that you make your reservations before you receive your refund check, as cabins are quickly being sold out. That might come as a shock to many of you, but people are booking early to take advantage of special pricing, so the odds of even finding a cabin at the last minute are low (especially if you need a cabin with more than double occupancy). Royal Caribbean announced that their new ship, Oasis of the Seas, exceeded the 6,000 passenger mark on a recent voyage.
What explanation is there for the high booking rates? I believe there are several factors including pent up demand (previously postponed vacations) and the excellent value that a cruise vacation offers.
If you are ready to start planning, the Cruise Finder tool (left navigation pane) can help.