@sophiebecky
It's the edge of the Chilterns so there are literally millions. I live an eight minute drive from the station and we are rural - completely surrounded by fields and woodland. I'd recommend joining a couple of local Facebook pages for more info.
Again get on the local facebook / insta pages. There are dozens of little tucked away pubs. It depends what you want. The Red Lion in Preston is a multi CAMRA award winning place, Redcoats is a gorgeous upmarket pub, that's just the two Ive been to since Xmas. Everyone has their own favourites.
The only specialist thing that I think we are missing is a good fishmonger, but I'm sort of hoping another Hitchite will turn up on this thread in a minute and correct me.
But as I said, if you want Michelin restaurants you just get on the train.
Covid really did wonders for the independent shops in Hitchin. We have fantastic little stores doing all sorts of stuff that people want to buy locally now they aren't going into London every day. A lot of the places are run by ex Londoners.
If you want big box chain places like M&S of B&Q you go up or down the A1 for fifteen minutes.
I think a lot of commuter market towns have gone the same way, but for that train line it's probably your best bet.