We tried to book this a month ahead and it was already sold out. The
rep at Disney told me this excursion sells out the fastest. Most people
book it 60 days in advance, this is the earliest you can do it. FYI, if
you are taking kids but not doing the dolphin encounter yourself you
can book yourself for the Blue Lagoon beach day for only 38.00 and
pay the big bucks for only those partictpating in the Encounter. J.