But didn't you see the fine print...? By purchasing in advance you saved $6!
Maybe it will help to break it down. You have access to 4 parks that are open at least 8-12 hours per day. So, average 10 hours per day. Times three people. 30 hours per day. Times 4 parks. 120 hours per day. Times 4 days. 480 hours. Divided by $700. Works out to $.69 per hour.
Now do you feel better?!