I'd say a military embark (stone/anvil to make armor and weapons) in an Untamed Wilds, either temperate or warm, level ground would be perfect for this. Have one dwarf make two weapons, then set two of your 7 to train with them while the smith makes them armor. The other 4 are on herbalist duty, maybe one on carpenter/wood cutting/wood crafting duty. Soon as your military is decently trained/armored, send them out on hunting forays against the larger wildlife. Keep up on the plant gathering.
If you don't plan on farming, I'd set up some way to get rid of the seeds (creating a dump zone on a refuse pile sounds good to me). Although, without farming, getting enough useful plants to brew for a reasonable amount of dwarfs will be difficult. I've never tried to keep an entire fort drunk off of herbalism returns; I know high level herbalists are great, but its entirely dependent on what grows randomly. Smaller embarks would make this problem larger; go with 3x3 or 4x4 I'd say.
If you do not plan on mining, I'd build a wooden palisade to keep most of the local wildlife out. In untamed wilds, many things see your stuff, think 'shiny!', then beat your dwarfs' heads in with their own pants. You will probably want to keep that to a minimum. Surround your camp with a palisade, and have your military train at the only entrance.
Also, build wooden pots to start with as they hold the same stuff, and more of it, as barrels.
All in all, sounds like a fun (and not necessarily !!FUN!!) embark. Great for fine-tuning your military building skills, dealing with local wildlife and making the most of surface resources.
** and I do not think dwarfs with butcher goblins without some raw editing. But with your military exterminating the local wildlife (mmmm, elephants!), why would you want to eat Snog Snotpicker?