Sites to look at:

Druid Stock
Barrow on the Downs
Baddocks Barrow (Southmead) approach with caution
Blaise castle hill fort.
Mere Bank (Avonmouth)
Nuclear Stone (Oldbury)
King Offa's Tomb (Almondsbury)

Nothing super special, but all good sites in their own right. Oldbury is a nice walk along the coast.

Anyways,

Ike