This cache was placed to get you out of your car to stretch your legs. You do not have to pay a fee in order to retrieve the cache. However it is only accessible when the maingate out at the highway is open.
IF THE GATE IS CLOSED DO NOT ATTEMPT TO GO AFTER THE CACHE
Museum Hours are:
Mon through Fri 8am - 5pm
Saturday 10am - 5pm
Sunday Noon - 5pm
So you can be certain the gate is going to be open then. There could be other unadvertised hours when the gate might be open.