Every time I see that page it makes me realise just how small and insignificant we are in the grand scheme of things, and how badly I really want to go exploring everything that is out there.
Yet you could spend an entire lifetime exploring everything that is 'here', and still not manage it.
Space is unfathomably big, and we are a grain of sand on the beach of the universe. But that grain of sand contains enough complexity and variety to fascinate for a practically unlimited period of time.
Mars is cool, and grand, and inconceivably different. I'd rather see the cherry blossoms in Japan, or go for a walk in the outback, or see tierra del fuego (sp?). And really, it's not even just the big things on my (long) list, but the billion other little things that one can do and see on this world given time and resources to wander from place to place exploring and experiencing.