Why not really push the boat out and spend another £3 for a whole line weekly season?
You can then experience the Roman ruins at Portus Abonae (aka Sea Mills - all my time living nearby I never did see any mills) even if they do just look suspiciously like foundations for a Barratt semi. Next, the shoppers paradise and vibrant nightlife of Shirehampton with its former Woollies, two Co-ops, three pubs - one excellent one on the river, two 5h1te ones in the village, oh and
Bristol's best kebabs. Then the bright lights of Avonmouth await with its heady aroma and regular insect plagues (nothing to do with the refuse derived fuel facility of course), you can stay the night here in the one star Royal
Infirmary Hotel ("unacceptable" Mark C - TripAdvisor), praying that nothing blows up nearby - particularly if Network Rail have blocked the level crossing. Next morning on to the sights and sounds (often deafening) of the Bulk Coal Terminal at St Andrew's Road (no longer by request). And finally take the air at the wind-drenched resort mecca of Severn Beach, promenading as you gaze wistfully across the stygian waters to the Newport steel works.
All that for nine quid a week? Bargain.
Don't forget you'll need to get a Photocard. It must be carried at all times you are using a Weekly Season. I believe the ticket examiners/conductors carry the blanks on board. Well, in my day, the lovely Rena did. You'll need a passport sized photo. It's helpful if this is of yourself.