there's a lot more out there if we seriously start lookingNot within individual limits of time and scale. The Moon is a couple days away, but for all we've looked at it seems it's little more than a dead atmosphere-free rock. The next nearest place to walk is a couple years away. Both will require hauling an oppressive amount of stuff along to stay there long enough to achieve anything resembling self-sufficiency. The sheer scale of time & effort - balanced against payoff of any kind - is vast beyond human comprehension. "Space is big. Really big. You just won't believe how vastly, hugely, mindbogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space, listen..." [Douglas Adams] Travel time gets a lot longer the farther the destination. Between Mars and the next place we have any hope of surviving on is a very, very long distance. I remember when Voyager I was launched: decades later, we're arguing over whether it actually left the solar system yet. Yeah there's interesting things out there...but don't underestimate how very, very, very, very, very far away they are.
Oh sure, look hard enough and we'll find "something interesting", and perhaps come to grok "why we're here" - but at enormous cost to those who don't get to go. Sure you'll find a few people actually willing & capable to make the trip (stark raving boring as most of it will be, even with a Morale Officer), but those "orders of magnitude of orders of magnitude" more people needed to make it happen don't get enough out of their contribution to bother contributing, and ultimately it's their paychecks that will be "redistributed" to fund the effort. Firefly Alpha will cost (optimistically!) about US$10M to launch 1 ton into low orbit, with that cargo assured to return at least $10M revenue; if not for that payoff, those involved have compelling reasons to elsewhere route money which provides a good life for some 400 people ... how much then the human cost of sending a handful of people on a trip which, beyond a couple nearby rocks, would take a lifetime or far more?
TL;DR - very little of space is close enough and interesting enough to get to before you're dead.