First of all check dronescene to make sure the area is not in a Flight Restriction Zone. If it’s not then that removes most of the risk of breaching some rules.
Secondly, pick times when the park is quiet (early mornings are good, but not so easy this time of the year.
I suspect within an hour you will realise they are not as difficult to control as you thought 
One final point …. I would recommend against purchasing the cheapest drone you can find (a toy drone). They are generally harder to fly, and you will outgrow it in the first week.
A DJI mini is a great starting point.
Take a minute to review this: