Tucked away in the heart of Cornwall, you'll find the Rising Sun Inn. They have a campsite just opposite the pub with shower and toilet facilities. If you stay at the campsite and eat at the pub, they offer £15 off your meal, so essentially you can stay for free. I've stayed here twice and can say the food is good, a little on the more expensive side (expect to pay around £20 for a main meal), but the atmosphere of the pub was great. Not too noisy and not too quiet on a Saturday at the end of April.