We are going home tomorrow, been on the north coast for a week.
Firstly, the weather forecast is changing literally by the hour, so don't trust it! See how it is each morning. Loads of days it's said it was going to be heavy rain all day, and actually it's turned out to be light showers and pretty warm.
We went to Eden Project, you can get tickets with Tesco vouchers so it only costs £8 per adult instead of £25. Not sure how long the tickets take to come through though.
We just got on with our planned stuff really, so put wellies and rain gear on where necessary. We swam in the outdoor pool on the campsite today in the rain, pool was heated and DD has a wetsuit so we just got on with it. She told me this evening that was her favourite thing of the holiday.
Stuff like the Minack Theatre and Land's End are free to walk around. There are some paid attractions but the places themselves are free to enter. We climbed St Michael's Mount in the rain, it was actually quite nice, cooled us off on the walk.
Only thing that had upset us was not getting to the beach, but then this morning randomly turned out to be utterly glorious (forecast to be cloudy!) and we had a lovely 3 hours paddling and building sandcastles.
And if all else fails, take a good book and sit in your caravan drinking nice wine and eating a metric tonne of scones and clotted cream. 