When you are going to sacred city Makkah in order to perform Hajj, try to spend all your time in doing worship or Ibadaat. The time in Mina is generally for reflection, on your life so far and on ALLAH Almighty, on Zikr or dhikr and reciting appropriate parts of the Holy Quran.
The Day of Arafat is the most significant day of Hajj. Utilize it to the maximum. You may be not able to get another chance. Take full benefit of standing outer side during Waquf to tell ALLAH Almighty that how Great He is and to thank ALLAH Almighty for all that He has done for us and our friends and family. Ask ALLAH Almighty for whatever your requirements are with humility and belief. If you have mentally and physically prepared well, standing in the scorching hot sun for two to three hours must not be a difficult task INSHAALLAH.
If you suffering from any kind of disease or sickness than do remember to take your medications on time. This is not the time that you get sick because you did not take your medication properly or follow your diet. In addition compromising your own Hajj, you might inconvenience other Hajees.
It would be more productive to perform all the rituals with peace and enthusiasm. A positive attitude and behaviour towards helping other pilgrims in any way possible may help you to have a very fulfilling Hajj, try to help out others in every way you can and do not expect the return and things to be done for you by others.