Hello Chocaholic! Have taken my 2 daughters to Cornwall a couple of times, but they were slightly younger then. We stayed in Polzeath at the Polzeath Beach Holiday Park http://www.polzeathbeachholidaypark.com/ - Its a site right on the beach, and a great beach for surfing/bodyboarding. If you have teenagers and they are into this, hopefull this will keep them entertained during the day. If you think its too quiet I would head northwards to Bude, where its a bit busier and I'm sure there is more evening entertainment.