Space is a truly massive place that you and I will never fully get to experience in any way unless space exploration, and exploration technology, begins to advance at a breakneck pace immediately.
Look at Voyager. The furthest a man made item has reach in space and it has barely gone anywhere when you really think about distances. I hope to live long enough to see something spectacular.
I've been interested in space since I can remember, and I guess I was born at the perfect age, a few years after Sputnik, and just turned 10 about the time they landed on the moon. I always wanted to see what it looked like on other planets, and now I've been given that opportunity with probes like Mars Opportunity. Would I want to travel there? Years ago I would have said yes, but now I know better. Most planets in our solar system you couldn't survive on, you'd be crushed or burned, or frozen in no time at all. Most of the ones we could send people to are dry frozen waste lands, like Mars. IMHO, it's not worth the expense or risk to send people there just to plant a flag. Better to spend the money closer to home for now, till they figure out some cheap environmentally friendly way of space travel.
For continued human space travel we are better off at this point in time of putting resources into developing and building a
space elevator. Blasting things through the atmosphere and into orbit under chemical power is expensive, dangerous, and ultimately unsustainable. At this point in time, building a space elevator would be far more spectacular and useful then sending "another" probe, or even people, to Mars. They keep talking about finding life on Mars or somewhere else in space, and how that will be a great discovery and change everything. BS, it won't change a thing. Not unless the life we find is more advanced then us and takes over our planet, then things might change. Finding some sort of microbial life on Mars, or one of the moons of Saturn, will have no impact on anything. They've already theorized how life on Earth might have been brought here from other planets, and I guarantee life has already been taken to the moon and mars, from Earth. Much as they try, they can't get those probes perfectly sterile before sending them into space. So is there life on Mars??? You bet, we brought it there.
There is one place I think they aught to try and explore more, and if I had my way, I'd like to see more probes on Saturn's moon Titan. There's some interesting things going on there with liquid methane lakes and an atmosphere thick enough to have weather and rain and erosion, but not so thick it would crush humans should they land there. In fact the atmospheric pressure on Titan is only 1.45 times that of earth, no pressure suit would be required. And with methane lakes the possibility of a fuel source once you get there seems pretty real, just bring a bucket and some extra oxygen. I've seen enough of Mars, Titan is place to go.