Divide $125 by $17.50/day to determine the # of days in the park your pass would get you:
$125
------------------ = 7.14 days
$17.50/day
If you use the pass for only 7 days, a little of the $125 you paid for it will be wasted. However, if you use the pass for 8 days or longer, your cost per visit drops below $17.50, a good thing!