Hershey Park Campground and ticket price???? for 1 night and 2 days?

So me and my sister and possibly a friend are trying to figure out how much a ticket is per person to go to hershey park for 2 days. We are hoping to stay at the compingground which we know is $53 for a cabin with cable/water/electric/sewer. But how much are the tickets? we looked and cant find the price....we found a 2 day flex ticket that is $71.50. so does that mean we each buy that ticket so we can go to hershey for 2 days and stay at the campingground once? So we are planning this summer to i guess go maybe on a wednesday....stay overnight at the cabin there, and then go back in on thursday......is that how it works?? please help me out if im missing something....i do know about the reservations....but u dont have to do them....but its recommended (but we have to stay 2 nights to actually reserve one...but one night i think we go and ask them if they have a cabin open.)