I would advise against bringing very little food. That only really creates a challenge for the first few years of the fort.
Maybe not farming any plump helmets? Or only farming above ground plants, once you get the seeds from outside or from trading, that is. That could be a little more challenging.
How difficult do you want this game to be? Do you want goblin neighbors, or no? I am running a fort now that has no goblin neighbors, I usually don't do that but I liked the area. It was an island with a volcano, coincidentally! For fun, I have a trade depot set up over the magma connected by one tile wide row of floor, that I deconstruct (from a safe distance) when they come to trade, dropping them in the magma pipe. I mostly just build this giant castle out of green glass and regularly smash any tax collector and hammerers that come to my fort.
Then again, if you want goblin neighbors, there are endless challenges of creating awesome ways of killing them.
You could have a goal of making a fort with no soldiers, only killing goblins with elaborate (but not automatic) traps (controlled by levers, or pressure plates). It's pretty easy to train a bunch of champion military dwarves that can single-handedly decimate a few squads of goblins, that's why I say that.
Or: there's the old no migrant fort. Maybe just let the first wave of migrants in to get a decent number, or not. Then build population by relying on only children born there.
Maybe you could also decide not to trade with your neighbors, be totally self-sufficient.
There's always the goal of creating some ungodly monstrous construction as well. Or maybe only above ground. Or using only wood. Or only glass.
Lots of things! That's my five dollars worth.