One of the best things to do when in here is to make exscursion day trip to some of small islands direction Hvar town and Palmizana islands towards to islan Vis and Blue cave to probably nicest hidden Croatian beach Smokova on Island Vis it incredible experience .Meet Croatia coast from different perspective .Island Vis become famouse after mamma Mia 2 was filmed there .Ask your skipper to show you locations from movie .Price it depending from period of year and type of boat if it is from 6 to 12 people .Price can be from 600 to 1200 depending from boat and gas prices .Departure is from any time you want lets say 8 am and return at 6 pm .Its private tour or you can share with other people and than you pay per person .More info in here .No need to pre book than some days before .Ill be happy to hep.I always check 2 biggest companies in Bol and sometimes they have last min deal 
AFITAT local Bol comapny with new boats like Colnago and great service from their skippers 
NAUTIC CENTER BOL also local company with brand new Colnago boats also great service .
Nautic center Bol is located near main beach Zlatni rat and offers manny other water sports or jet ski so click here to see  .
Last but not least Aqua park Bol provide great fun for all familly click here for more