I wasn't expecting much from this film, but I ended up loving it quite a bit. It's a great kid's adventure, lots of mystery and action, good character development, and plenty of cool settings.
Bill Murray and Tim Robbins do a fine job in their roles, but they are mostly supporting cast. It's the two kids who are the real heart of the story. I also love how the filmmakers created an entirely plausible distant future where beauty still thrived despite crumbling infrastructure. Above all, this is a movie about hope for the future.
If you are looking for a good adventure similar to THE GOONIES, check this out. Great for kids, and great for folks of all ages who enjoy light adventure.