THE BEST SIDE OF ISTANBUL AIRPORT TO ANTALYA TAXI

We've been 6 arriving to the new airport in august planning to beykoz island, what transport is it possible to propose will be better and kind of the amount can we assume to pay for ?I need a return taxi back again on the hotel at 23.thirty – what am I envisioned to pay for? Should I hail a fresh taxi or check with my original driver to return?Th