In the back seat of their snowmobiles sat several styrofoam coolers filled with diet sodas but, as it turned out, the kids didn't get thirsty, which is just as well, because the sodas quickly became frozen.
When I read the line about how everyone "can snuggle and watch the submarine races in the back seat of their snowmobiles," I immediately pictured Groucho Marx saying, "How the submarine races got in the back seat of their snowmobiles, I'll never know." (If anyone fails to understand the reference, please watch the first few minutes of Animal Crackers.)