What sort of photography are you in to?
Portishead is really nice if you are not the sort of person seeking nightclubs. If you like walking its great as there is a lot of variety.
Its one of the few areas locally with a thriving High Street.
Things worth a look:
Portishead art trail (various installations, quite interesting).
Marina. You might get to see the new lifeboat launch if there is a call out.
The lake / seafront area - includes bowling and cricket and various other events.
Lots of annual events - carnival, raft race, flowershows, Portishead in Bloom events, Am drama events at hall.
Nature reserve between Portishead and Avonmouth docks
Its the closest point in the UK for deepwater shipping to pass the land, so huge car transport ships etc REALLY close
Open air Lido. Heated. Great new cafe run by voluteers to support the community owned pool. Night swims sometimes available.
Indoor swimming pool and sports centre
Costal path walk entirely off road to Clevedon arriving near Clevedon pier and a lot of nice cafes
Woodland walks
Tinca Gallery in High Street, lots of nice stuff, not snobby, wide price ranges
Huge open space by the Windmill Pub (dine there, view is fantastic. open all day). Public golf course next to it, put money in tin!
The Royal at the far end of marina and up the steps is also good for food and view of water.
Lots of old buildings
Quircky little lanes not far off High Steet to little old cottages, though you have to look to find the lanes.
Interesting building near local church (view from road only)
The new housing areas are flat, the old areas are definitly not, other than the high street.
Nearby
Woodland walks in nature reserves
Clevedon (ride the Balmoral preserved ship from here or from Bristol)
Portbury (used to be good dining in the pub there, not been for a while)
On road to Bristol is Brakenwood garden centre. very prettily done and the cafe food is very good
Towards Bristol (15 min drive) - suspension bridge, Leigh woods, Ashton Court, circular dock walk, Clifton village, Bristol zoo, Bristol aquarium, SS Great Britain. Lots of good museums look them up.
Only downer is rush hour - try to avoid leaving Portishead in morning rush hour (7.30 start) and try not to enter it around 4.00 - 6.00 as it has few access roads and its a very popular location to live, prices have soared there the last few years.
Let us know how you get on.
I took a friend around the marina on a sunny day - they said it was like being on holiday in some nice European coastal area because of the atmosphere.
You can get 'poulty mix' grain from the pet shop in the high street to feed the swans at the marina, the price is only 50p or a quid.