We'll be going in middle of Sept for one day/night, questions: Need a reservation? Does hook up include electricity? Thanks

I would recommend a reservation and there are a limited number of sites with electric

I'd recommend a reservation. You can try coming early without one and get lucky but it can be hard. It's easier in the middle of the week

You should reserve. Walk ins are limited. Not sure about hook up.

I reserve the site, went in Nov and it was packed, I did reserve very advanced

No, you don't need one