Good place and unusual for the UK to have places like this. I always see lots of continental motorhomes there but rarely any Brits. I have never been able to understand this
Headlands camp site - http://www.headlandcaravanpark.co.uk/ - has good waste dispoasal facilities including the continental drive over type. These facilities are at the bottom of the camping field. The ground can be soft going if it has been raing so be careful.
Just book on there for a night, take on fresh water and drop off waste.
Good base for touring although some of the roads are narrow. I find that with Cornwall roads it pays to be heading for your next stop-over early in the morning. The vehicles you encounter are usually commercials or locals going to work. They are used to getting thru tight spots and expect to get their cars scratched