Misc. Accessories and thoughts:
Sunglasses that sit flush on the bridge of your nose. Any gap (such as found on Ray-bans) will give you an unsual and uncomfortable stream of air into your eyes, and can produce a lot of tears.
A trowel. For those long country rides. It's good manners not to leave evidence that you were there....
Keep clean. I used to scrub off with a wash-mit twice a day, and my collar was never cleaner. Which meant a lot less washing of clothes.
Do not carry anything that is not essential. Such as books or big lenses for your camera... and try to avoid carrying anything on your back.