In reply to Levy_danny:
I'm in Manorbier, west of tenby on the coast path. beautiful run from Tenby - Manorbier the stretch to Lydstep (going past penally) is about the flatest part of the whole coast path. Once past lydstep beach it gets a lot more up and down. Great to do a one way run and get the bus back, or get a lift from your wife? From Tenby, Lydstep bus stop is about 4 miles, Manorbier Skrinkle estate bus stop about 5.5 miles or Manorbier beach then up to the bus stop in the village is about 7 miles.
Great circular runs from 2 - 8 miles around stackpole estate, stackpole head, bosherston, st govans head. This area is not to hilly either.
How far do you like to run?