Does this cost to use the pool area?

There is a Vehicle entry fee to get into the park itself. It’s four dollars for a Delaware car eight dollars for an out of state car. The waterpark is based on the day of the week and how tall you are. It ranges from $6 to $10 per person. It is not included with Camping

If you are camping there the use of the pool is included. Otherwise there is a minimum fee.

Yes but it's not expensive at all.

Yes. Prices are listed on the Delaware State Parks website.

Yes