Your Rockhopper looks to be in amazing condition. What a great find!
A Rockhopper served me very well for several years with rear rack and basket for grocery runs and other carrying duties.
I think mine was a 1990 and I ran some fat street tires on it. It was a nice ride which I no longer have.
These are very versatile bikes that can work well for a variety of purposes.
If of interest these two threads show lots of vintage mt bikes and highlight what the owners have done to make them work for their riding style.
Caution, it can be very time consuming to look through all the cool builds.
Road bar conversion thread:
http://www.bikeforums.net/classic-vi...sions-265.html
Upright bar conversions thread:
http://www.bikeforums.net/classic-vi...rsions-17.html
Enjoy your new ride as is or customized to your preferences.
Along with your recent Miyata 1000 find
your cool bike finding radar is work well.