Since you are in Lincoln, NE you may want to look into the BRAN ride. It's a little more distance than BRAN or GOBA. But for a week long ride it is a nice ride.

I live in Nebraska but my touring buddy and I like to ride the GOBA ride it is in Ohio and it is better suited for me. GOBA has 7 days of riding, the shortest is normally 35 miles and the longest is about 70. There is an optional century ride but that is strictly optional. GOBA also has two rest days, on the rest day there are rides of 50 miles and a 50 miler with the option to ride 100. But these are rest days so the rides are back to the same campground that you started at, so if you are tired or sore you can take the day to sight see.

Also, GOBA alternates each year with a hilly and flat rides. The first year I rode GOBA the tallest hill that I rode was an overpass over the interstate. It was that flat on the flat ride,