If for some reason you do end up in Jesmond, Fat Hippo & Jam Jar are good for burgers (the latter can be a rowdy bar in the evenings though) - otherwise, avoid it. The Dene is nice for a walk though in the day.
Most of my recommendations are from @nestor tbh but I went to a great taco place in a shipping container on the quayside the other day, Newcastle is also weirdly good for BBQ food - Bierrex is the best and is a full on craft beer wanker place, Longhorns also very good. Redhouse down by the quayside is good for pies and is a cool old pub. The Bridge Tavern is meant to be great for food (I’ve only had bar snacks but v. v. good)
Errr yeah Free Trade Inn is amazing too. Fucking loads of good pubs tbh. Really grew to love Newcastle over the last few years.
Oh and Bierrex has an underground cocktail bar that sounds really wanky but is a great place for a drink after the pubs close.