Sunglasses are a really good idea. I have three sets of lenses for mine; yellow for overcast conditions (the sun seems to come out!) and two darker pairs... not sure what's the difference.

Re. food, best go for carbs with low glycemic index. That is, coarsely ground grains that take as long as possible to digest, so you don't get a jolt of sugars all at once. In theory whole grains would be better than refined, but in practice even whole wheat flour is usually so finely ground that the benefits are pulverized.

Question: What do you buy if you have to stop at 7-11? (I get V-8 juice, fig newtons and corn chips).

Always carry money, ID, and a card or something that says "in case of emergency call [someone who's not on the ride with you]".

Some sort of a rudimentary first aid kit is a good idea. The only things I've used in mine are: paper napkins (lots of them!), those wet-wipe things in the little foil pack (just a few), and a pair of tweezers. Bandaids are probably a good idea, but I've never had need of 'em.

The nipple thing is totally new to me, in fact I strongly suspect you guys are pulling my leg. Ditto chamois cream.