Once in Dalyan, walk along the water and get information from several different boat captains and companies. The ones with stands may or may not not be the best deal. For larger families, finding a boat that you can have to yourself is an ideal option. Otherwise, smaller families can get seats on a day-long cruise. Bartering for a great deal is expected with all the boats you can choose from.
Boat cruises will include food, but drinks are paid in cash on the boat (and very reasonably priced).
A full-day boat trip will take 6 hours, from about 9 a.m. to 3 p.m.
The summer season along Turkey's Mediterranean coast offers great weather from about May–September. The busiest time for tourism is late June through September.