You better check their web site or call before you go the tracks were closed due to flooding. The trails were open (two small loops) but the guys I talked to that work at the park advised against riding them. They said the ground was still frozen and hadn't been groomed in a while. That was Wed night 2/4 things may have changed since then.
Yeah it is expensive if you are just going for one day, again check the web site or call for details.