Abbotsbury to Ferrybridge along the Fleet
The long one: the coast path inland of the Fleet from Abbotsbury back to Weymouth.
About 18 km of South West Coast Path from Abbotsbury, past the Swannery and the Moonfleet shore, along the landward edge of the Fleet lagoon to Ferrybridge. Mostly level with a few short climbs, some stiles, and long stretches with nothing to buy, so carry food and water. Take the bus out to Abbotsbury in the morning and walk home.
Where to start
Getting there
Bus X53 from Weymouth to Abbotsbury. Finish at Ferrybridge for the Portland buses back.
Sources: South West Coast Path Association. Toilets and cafes change with the season, so check before you go if one matters.