I visited this place back in the late 90's.  I figured it was time I reviewed it.  My fondest memories were of the mosquitos.  Bring some high percentage deet bug spray for your protection.  The waters of the Niobrara are some of the best in the world for recreational canoeing or tubing.  The frequent sandbars of the river make it perfect for those who want to take a break from time to time.  Smith Falls itself is very beautiful and worth it for the quick cold shower. 

Primarily, this area is for those who wish to take a day or two to canoe the river.  I would prefer the guided tour so you don't miss things like the 45 degree water that naturally feeds the river from underground springs. There are usually just class one rapids on this river, so anyone should be able to enjoy the waters the whole trip.