We were able to reserve a day trip to the Blue and Green Caves by shopping around the day before. Several companies offer various excursions from Hvar, it just depends on how much time you have and what you are interested in seeing. We left the port of Hvar around 9:30am with a return time of around 6pm.
Island Hopping Around Hvar (Bisevo, Vis, and Palmizana)
in Croatia