Here is a route starting in Somerset and heading towards the Dorset coast. It includes spectacular coastal scenery, a good place for a pub lunch, and a visit to the Cerne Abbas giant. Much of the route is ideal for a Seven, although on a busy summer day you are likely to get stuck behind slow vehicles.
It would go very well with the Cheddar Gorge blat if you have an extra day in the area.
The route is here: MyRoute
It starts at the A303 Podimore roundabout and heads to West Bay via Crewkerne. West Bay is a good place for a morning coffee and a quick look. Interesting fact: Reggie Perrin walked into the sea here.
Follow the coastal road and admire the beautiful views of Chesil Beach. Pass through Weynouth. I suggest that The Red Lion in Winfrith is ideal for Sunday lunch. The carvery is good and they are generous with potions.
If you have time, then nearby Lulworth Cove is worth a visit. There is a large pay and display car park with toilets/cafes etc. The cove is worth seeing, but I suggest the 2.5 mile walk to Durdle Door is really worth the effort. Durdle Door is a spectacular natural arch.
Follow the route past Dorchester to Cerne Abbas. Then stop at the layby to see the giant carved into the hillside.
Follow the good roads past Sherbourne back to the A303.
I hope that this is useful,
Simon (Somerset AR)