To go on big hunts like the two day hunts requires energy. To get unlimited energy go to your settings and select 'Date and Time' and set the date for tomorrow. When you return to Deer Hunter Challenge you will now notice that your energy level is filled to it's maximum.
The following is an easy way to get a ton of coins/money. To do it you have to go to 'Home' and to the second page and press 'Settings'. Then go to 'General' and scroll down to 'Date and Time' and press 'Set Date and Time' and move the day 1 day. When you go back to Deer Hunter Challenge there will be a bonus. Keep repeating until you have the desired amount of coins/money.