Well, an idea I probably won't be able to do could be a small sailing vessel/private yacht traveling the world. What they do while traveling would be an added gimmick like solving crime, mythological (treasure)/xenobilogical (cryptid) exploration (hunting), or committing crimes. Although for a free-RP I'd suggest something simple as fight-club, but not a fight-club.

Another idea could be a team of test-pilots, or a flying exhibition team. Just add a few aliens and mechs and you'd have plenty of hooks in the water for that.

Another end of the coin would be a convoy/caravan escort traveling through pirate-infested waters/the green zone, basically just making sure everybody gets the basics for rebuilding a near/post-apocalyptic society. If that doesn't work, throw aliens zombies and cryptits at it until it [i]is[/i] interesting. Lots of armed yachts/merchant-ships or mad-max gun-trucks to play with.