Stops along the way
A handful of friends and some family were going to be along the marathon route, to give me encouragement and/or anything else that I needed. Because there are litterally hundreds of thousands of spectators, the only way to find the people that you know along the course is to pre-arrange meeting points.
There's a lot to take in while running 26.2 miles, so you can't remember everything. So that I wouldn't forget where my family and friends were going to be at, I wrote the meeting points on the back of my hand. This gave me something to look forward to, at different points in the race.
I had six points along the race where I had intended to see people. Only the last two actually worked out. Thankfully, these came at a time where I needed to see someone that I knew the most. Hugs, fluids and encouragement ensued.