There are lots of rocks etc, one trail is a loss rock road, that went to a dirt road that was flat. The area near the ranger station is paved and you may be able to hang around there. It's close to the river. depending on the wheelchair you will have to decide what it is able to handle. If you are looking to see gorman falls, the trail is difficult and steep. Hikers should be ready, it takes a lot to get down and up, but is possible for everyone as long as they have plenty of water.
Many are rocky with steep hills.
No they are not. They do have some flat parts but most of the trails have parts where you need to climb or cross over the creek.
I don't know. The one I was on wasn't.
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