On your weeks holiday, I'm sure you'll want to be able to relax and have a base, but also not spend too much time in the car, and so it's for this reason that I have suggested having two stops on this itinerary, spending 4 nights in Salcombe and 3 nights in Dartmouth.
So, Day 1, you've arrived in Salcombe! I've suggested the Harbour Beach Club as it is a truly gorgeous hotel with the beautiful South Sands beach right in front of it. There is a spa, a great restaurant and bar on site so you have everything you could need.