You want to start giving tours of your site and the interesting facts about each location, but your budget will not allow for the addition in staff or hours.
For a fraction of the cost, PointsMap can be used to give virtual tours. Since each Point of Interest is able to have an unlimited description and links to just about anything, you can put as much information as necessary at every location, and with Groups you can incorporate multiple Points at or near the same location to be easily locatable by visitors.
For outdoor locations, PointsMaps "Where Am I?" feature can use a smarthphone's GPS to locate and show visitors exactly where they are in relation to Points of interest.