You need to identify a gap in the market first surely?
Plus as pps said take account of what skills/experience you have
If it were me, I'd do an old style sweet shop/confectioners.
Nostalgia is HUGE just now, and it would require less work to set up and regulations to deal with than a cafe.
You could include home made chocolates and locally known confections (not sure where you are but eg if it were here in west of Scotland then things like tablet and macaroon would be popular but I've lived all over Uk and know most locales have equivalents eg pontefract cakes, Edinburgh rock pieces, Everton toffees, Kendal mint cake...)
And retro sweets in the old style jars sold by weight - pear drops, cough drops, rhubarb and custard, sherbet Bon bons etc
I bet that would do a roaring trade with locals and visitors alike.
You could (if this is still legally allowed I think it is) even still use a retro mechanical scale, get a retro designed logo and have all your paper (eco) bags for the sweets printed up with it.
You could possibly even look into getting your own lettered seaside rock created for the shop even if you're not near the coast.
Maybe even retro drinks if they're available? Ginger beer, bitter lemon and dandelion & burdock I know you could get.
Just a thought...
You could have a sideline in small locally made trinkets as gifts or maybe combine with a deli type section selling not only modern delicacies but maybe some more unusual retro ones like potted meats or locally made jams and pickles?
You can't rely on tourist money it's too seasonal so you need to look after potential bread and butter local customers and something that's likely to bring repeat business
Online tend not to be any good for small amounts of things.
But yea I can see why you're being advised to go down beauty/hair route as that can't be put online.
Doesn't have to be the Botox type route, what about therapeutic massage, pedicures etc?
I must say I'm very uncomfortable with non medically trained people doing things like Botox personally I don't think it should be allowed