Well my wife and I plan on taking longer journeys on the Katy Trail, its mostly flat but very long. I just want to put myself in the best position so I don't crap out so quickly. And yes google is great, but I trust you guys way to much for advice.
Such as gator aid instead of water for the electrolytes. Tips like that I guess, such as certain B vitamins or anything that can counter act the acid buildup in your muscles.