Why does it say pay 10 under the core creek park entrance across the street from neshaminy middle school?

I think it means pavilion 10. Maybe that is a part of Core Creek Park?

Yes. Pavilion 10. The only way you can't use a pavilion is if it has a paper stapled to a pole next to it saying it was reserved. That means somebody paid to hold that Pavilion for a group

It was free for us

yes it is part of core creek there is a couple pavilion's that you can rent so it probably is # 10

I honestly do not know, I haven't noticed it before. Curious I will have to see!?

It's free!

I'm not sure why it says that, access to the park is free

Its free where i go by the boat rental