Are the roads in park good enough to ride bicycles?

No it's a small park but a great one well taken care of

I think so.

Yes as long as you don't get off of them. As Keith said it wouldn't be a very long one and I wouldn't ride on the main road coming into or exiting the park, extremely steep and no place to go if a camper is coming in or exiting.

I think so. It would not be a long ride though.