Not sure when you plan to be in the Hayward area, it might be hard to find a cg now. I would suggest you check with the Minong & Hayward Chambers of Commerce for a list of cg's in the area. Also check rvparkreviews. Your length of stay is going to depend on what you like to do.
This area is primarily a boating, fishing and mountain biking area, with people staying in resort cabins or their own summer cabins. There are only a few museums, limited shopping and restaurants, plus a medium casino. So for me, this is a drive thru on my way to Lake Superior,the UP of Michigan, etc.