ah. I didn't realize you were new here. The jumps I saw were on a trail off-shoot just before a tennis court. That was last fall. It might be all closed off now. I haven't been to Cherokee in a few months. The jumps have probably been dismantled by now. I don't remember if the whole section was closed off or not. I think it was.
I haven't figured out how to bunny-hop any good a mountain bike. (I can do it on a bmx bike just fine though.) I just try to easily roll over stuff (rather than "ramming") by lifting the front wheel up and over and then transferring my weight forward to slightly lessen the impact on the rear wheel.
By the way, you should try out Seneca too if you haven't yet. I usually like to make one big loop out of Cherokee and Seneca.