Organised tours to Dim River and Dim Cave are sold from Alanya hotels and from Side/Manavgat — they include hotel pickup, a guide, and a fixed programme combining the valley restaurants with the cave. The advantage is simplicity; the disadvantage is the group meal at a specific restaurant rather than your choice of the valley's options, and a return timed to the tour rather than to when you feel ready to leave.
For Alanya-based guests, the dolmuş from the harbour is the most independent option — 15 km, straightforward, and genuinely useful for a midday arrival. The limitation is the fixed last departure in the evening. If you want a long, slow riverside lunch into the early evening, the dolmuş timetable becomes a problem.
For all guests from Side westward, the distance makes the dolmuş option irrelevant. Private transfer is the practical approach — door-to-door from your hotel, confirmed return at your chosen time, driver who waits while you eat. The flexibility to add Dim Cave to the same transfer without arranging a second vehicle is a genuine advantage over any tour format.