AKMike,
How interesting! Ukraine will be a remarkable contrast with Alaska so if your group is adventurous, as Kuna said, they will have a good time. People pay a lot of money for guided tours to the FSU, so your group is getting a bargain and a better guide.
Much depends upon the individual personalities and the group dynamics. How you sort that out will be interesting.
My 18-yo son accompanied me to Moscow. His favorite time was playing with my fiancee's children. We toured a few areas in and around Moscow; however, coming from Florida he complained about the cold weather even though it was April. As is his nature, a year later he talks fondly about the remarkable times in Russia including some things I thought he disliked.
There is so much to see between Kiev and the Crimea. I could easily spend a week in the Yalta area alone and do something different each day. You will there in spring time with the trees blooming, so the countryside will be lovely. However, the nature experience will be disappointing compared to Alaska.
Will you rent a travel van? That will give you much more flexibility. The roads are not bad, and some are rather good such as between Kiev and Odessa.
Somehow try to arrange an authentic banya experience, eat most lunches as a picnic, mingle with the Ukrainian people when they are partying, etc.