If you have seven days to spend in North Dorset, here are some suggestions:
Visit Stourhead, a National Trust property with beautiful gardens and a Palladian mansion. Allow 4-5 hours for the visit.
Explore Sherborne, a historic town with a castle and abbey. Take a walk around the town, visit the two sites, and have lunch at one of the local pubs. Allow 4-5 hours for the visit.
Go to Shaftesbury, known for its picturesque streets, Gold Hill, and the ruins of Shaftesbury Abbey. Allow 3-4 hours for the visit.
Visit Stonehenge, one of the most iconic sites in the UK. It's around 45 minutes from North Dorset and needs at least 2-3 hours to visit.
Head to Cranborne Chase, an Area of Outstanding Natural Beauty, and explore the countryside. You could walk one of the many trails or visit the market town of Blandford Forum. Allow around 4-5 hours for the visit.
Go to Kingston Lacy, another National Trust estate, with beautiful gardens, a house with many treasures, and a restaurant. Allow around 3-4 hours for the visit.
Enjoy the coast by going to the seaside town of Weymouth, with its long sandy beach, harbour, and many restaurants. Allow around 4-5 hours for the visit.
For accommodation, you could stay in any of the towns mentioned, with Sherborne and Shaftesbury having the most options. You could also look for a holiday cottage or B&B in the countryside.