The modern town of Kas occupies the site of ancient Antiphellos.
Among its scattering of attractions from antiquity is a Lycian sarcophagus in the town center, a well-preserved theater on the west side of town with fine views over the bay, the remains of the ancient town walls near the harbor, and some Lycian rock tombs to the northeast.
If you're feeling active, an afternoon spent exploring these remnants will give you a feeling for the history of this tourist town.