The Travertines in Pamukkale are absolutely worth visiting. However my personal recommendation is to stay a night in the area and arrive there really really early. In season it starts to get very crowded after 9.30 in the morning. It´s a beautiful must see spot. We stayed at Tepe Camping . It has a great view about the area (unfotunately not at the Travertines, but beautiful, though).
The upside at Tepe Camping is that they serve good BBQ and it is really close to the entrance of Pamukkale. And for one night it´s absolutely o.k.
You should shop your groceries before going to the camp ground as you´ll have to drive 20 minutes in order to get some from there…