Mayhaps you are about to inherit a natural hot spring. Consider investing in a soaking pool (or two), piping this natural hot water in... and make some room for parking.
About $4 a pop is a bout right... maybe 30 visitors a day.... 6 days a week....
Sound like... an extra 3-Grand or so a month... just for having hot water...
Sha-zaa'am -- Instant entrepreneur....
Regards
Most of the folks who go to Hot Springs in Cali are stinky hippies with braided armpit hair...and insist on having sex in the springs...
10 grand a month still wouldn't be worth it imho...