A quick run down (I’ve lived in bristol for 30+ years)
Corn street; A cobbled street full of bars (walkabout, wetherspoons etc), most of which open late. Generally quite young and very lively. Also has 2 lap dancing clubs very near by. Can be a bit punchy. No eating here.
Harbouside/waterfront; As above, but with a lloyds, and a terrible nightclub (Oceana). Apart from oceana maybe a bit less punchy. Not really the place to sit down and eat.
Centre; Not as many establishments as it used to have so maybe slim pickings. It features the taxi rank which at the end of the night can get rowdy. Some chain type restaurants.
Lloyds ampitheatre; Less rowdy and a slightly higher class of hooligan but it doesn’t had loads of places. Has a Hooters and some other eating places I think?
Park street/park row Pretty nice, places to eat but won’t be cheap. Mixed ages and some chilled places to drink.
Old market Gay quarter (if you’re into that)
Clifton triangleA higher general class of hooligan again. Late bars and a few places to eat (tapas, eastern). Po na na and the lizard lounge are popular.
Clifton Has some great pubs, restaurants but none/very few open late. Very little chance of trouble but you will have to endure some vert pretentious, snobby ****s.
Stokes croft; Very cool, multicultural and chilled but you do not want to be annoying people around this area (St Pauls frontline close by).