I agree with jawgee about the maps. Keep in mind they are large maps. We did ours on the floor, but you could use a table, of course. I was surprised how large they were, but they are beautiful. They are stored in a large tube.
My kids were 3 and 7 when we did Paddle to the Sea and 4 and 8 with tree and the trail. They did much better the second time around (maturity). My son (youngest) loved listening to the stories and since my daughter doesn’t always like all the coloring, he helped out with great enthusiasm. I think it really depends on the maturity of your kids as to whether they are ready. In the beginning of the guide she tells you not to overwhelm the young students with too much written work. I think that is a wonderful guideline.
A little tip…we learned to caterpillar (zigzag) the outlines of the states and rivers instead of coloring them all in. It’s not really easier, it just looks really nice, imo.
hth
Rebekah