Kocain Cave is a nice, short excursion from Antalya — a short day trip if you do it by car like I did, but a bit ambitious to do in a day by bike. The route is pleasant with little traffic so it’d be a great route to choose for a bike tour heading north out of Antalya. The cave is a few kms off the paved road above the village of Ahırtaş. The dirt road was rough enough that we choose to walk most of it to get up to the cave itself.
The cave has a huge entrance but is big enough that you can walk back to areas where it’s completely dark. The air in the cave was a bit cooler than the outside air when we were there at the end of May.