Dorset is possibly my favourite county. Really beautiful countryside and interesting places to visit.
The coast is sublime. Although it is a few years since our last visit we always went to The Hive Beach cafe for the best fish/seafood lunch ever. Near Burton Bradstock if I remember rightly. They have a website.
Thomas Hardy country yes and his home(s) are good. Dorchester pleasant, Lulworth Cove and nearby are stunning plus other places. Crowds in peak times are more problematic now making some places hard to visit, like Lyme Regis but had the best ever crab sandwich for lunch there. Just had to visit outside of school holidays.
Just an added thought. The Swannery is worth a visit too. The only place where the swans are not ringed as royal I believe.