I have found most to be friendly, Maggie, helps, she is so friendly, she makes people want to stop and chat
and if they don't pet her she pouts now
I would not be concerned about such a large park not feeling friendly. State parks, Coe, etc., where people are more apt to be traveling and out on an adventure of their own, will share and also be interested in what and where you are going.
Good idea is our member map and contacting a member that you will be in their area, and so many will just come camp with you, visit over lunch or spend a day showing you some of the sights in their home area. So don't judge your solo traveling by a huge park, unless you are going to stay there for months and then as in any neighborhood, you have to slowly work at making friends, as those residents have been there and know each other, probably for ages. I am experiencing that situation now, no one comes down here near my rig, but if I walk up to the front, around the office, I may find someone who is available for a chat. If I told them I would be here each year, for winter or portion of the year, some might be more friendly but I probably will never come back to this park, state park I love near here only allows two week stays, so I can't use it this trip.
Good Luck, being friendly yourself and loving what you're doing is the key to finding people to chat with. Forget the couples mostly as the wife is not going to allow that, but there are many females out there alone and men too, so just plan to enjoy yourself and you'll have a grand time. You must always be alert as to your surroundings though as you do at home, shopping or wherever you are these days.
Enjoy,
CArol