We will be spending 2.5 days in the park in late August, staying in the 49'er Quality Inn in Jackson. I would like to take a dinner float trip with GTNP, gtlc.com/activities/outdoor-fun-floats.aspx. I called them, and the meeting place is Jackson Lake. So if we do this, we'll be driving back to Jackson after 8:30pm. Is it possible at all? Or would you strongly advise not to? The lodges in the park have availability, but they are about $100 more/day without breakfast.