1, Depends on weather, park attendance, how many people are in your work crew and how many of them actually showed up to work that day. Your shift my be 5 minutes or 15 hours, but "if" everything goes as planned you get around 7 hours a day. At least that was the case in the department I worked.
2, 40 X 7.25 = $290 (before taxes), So, don't plan on living in Mason or anywhere near the park, driving a luxury car to get you to work, or ever ordering anything besides $1 menu items or what's on sale at the grocery store. Plus you'll want to make sure you don't get ill or injured. Yes, the park does offer insurance to their employees, but that will just eat up about another $20 a week out of your paycheck and you'll still have to make a co-pay.
3. Math test to work in games, drug test at the beginning of the season to work in rides or maintenance. Everyone working at the park is subject to "random" (a.k.a. don't screw up and we won't test you) drug test for any position held during the season.
Is working at the park fun? Sometimes. I'm sure it's more enjoyable for someone in their teens than it is for someone who is in their 30s or older.
Are you going to be able to "make it" without living with your parents, a roommate or having another job? No.