1. Counter System: 

     Using an IR detector to count the number of people passing by a certain route, and updating the trail path guiders accordingly.

     Using an Ultrasonic ranger to do the same.

2. Difficulty/Safety of Path: Pre-stored data.

3. Environmental Factors:

     Temperature/Humidity: Using a DHT 11 sensor.

     Soil Moisture Sensor

      Ambient Light: Using a TEMT6000 sensor.

4. Path lighting system: Neopixels