It's a great animated movie, and if animation makes you think, "Hm, kid stuff," you're on the wrong track.
This is great story telling, great animation (with amazing attention to detail), and great fun.
The journey to Paradise Falls (the name alone is a lovely variation on an ancient theme) is a beautiful meditation on the things that give us the courage to live.
Go and see this movie. Borrow somebody's kid if you need an excuse.