For accommodation its got a number of options from rustic beach getaways like KSL (www.kitesurfinglanka.com) to high end hotels. KSL offers backpacker style accommodation to premium room bungalows.
Kalpitiya is rich in history. Its 3 hours from the airport. Wilpathu National Park is close by. You can also venture to the ancient city of Anuradhapura from here.