Janaza (funeral prayer) & Duas
Also VERY IMPORTANT: Learn the fiqh of praying a Janaza (funeral prayer). You will be doing it after every single prayer, no joke. (There was only one prayer in our entire 2 week stay that we didn't.) Learn the dua for it too. Praying at someone's janaza is a very good thing and you have ample opportunity of participating so take them.
Also learn the dua for visiting the graveyard.
You don't want to go to the Baqi and not know what to wish! or visit the grave of the leader of the martyrs Hamza at Uhud and not say you dua!
Salams on the Prophet
Also learn the different ways to send Salams on the prophet (saw) for the time you are in Madina.
Learn what is allowed and what is not. Insha Allaah after this Hajj season, I will try and put an article on Loving the Prophet sallahualahiwassalam
Another good suggestion is to draw a chart of the Kaaba (looking from above) and along each of it's walls (and along each of the special points), write the relevant duas
PREPARE yourself mentally for a lot of frustration, mental anguish, annoyance and anger. To obtain a Hajj Mabrur (one that is accepted and forgives all your sins) you must not let these things interfere with your goal.
PREPARE yourself physically for a lot of walking and physical exercise. You may be walking back and forth from your hotel to the Haram at least 10 times a day, not to mention logging Tawafs and Sai'ys that come out to miles in the end.
