I have made a one day itinerary to Bristol from my travel experience. Click the blue links for detailed explanations. And check the list of attraction (at the bottom of the page) also you need to consider.
We first visited Cabot tower. There are lots of road side paid parking areas are available in the town. Bristol Cathedral, Millennium square, Bristol harbour areas are in walkable distance. To SS great Britain, you need to cross the River Avon by the ferry from the harbour area. The ferry fare is very minimal. There are also lots of options for dinning out. Clifton bridge is about 10-25 minute drive from the main city. You can use the road side paid parking if you are going by car. Click the blue link for more details,
Bristol Museum & Art Gallery
Cabot Circus
Aerospace Bristol
We The Curious
Clifton Observatory
Bristol Aquarium
M Shed- MUSUEM
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