Where to stay in Cornwall?

I love Boscastle, Tintagel and Trebarwith but the walks are definitely not flat ones. My favourite walk in the world being along the Valency valley from Boscastle, through the woods and up to Minster Church. Once you get beyond Bodmin you may have to add another half a day to your journey. Most of the coastal villages seem to be on hillsides and places like Port Isaac often don't have parking outside so you have to carry your luggage a long way. I'm desperate to go back to Cornwall, not having been there for many years. My [misspent] youth was spent there. I've always wanted to stay in one of the National Trust properties at port Quin but they don't allow dogs.

I like Falmouth and st mawes

So many options, Marion! You should decide whether you prefer the north or the south coast first. The Roseland Peninsular is beautiful but I'm not sure it offers flat walks. Do you want to visit the Lost Gardens or the Eden Project or the Tate at St Ives? Do you want to go shopping? If you like beaches there are so many beautiful ones but I can recommend Gwithian and Godrevy.