There is provided a system for providing interactivity to a guest of an experiential venue, based on sensor measurement of the guest. The system comprises a sensor configured to sense a guest variable of the guest, where the sensor may be a biometric sensor, a facial recognition sensor, a voice stress analysis sensor, a gesture recognition sensor, a motion tracking sensor, or an eye tracking sensor, and may sense heart rate or another guest variable. The system also comprises a control system, which may be implemented as a computer, in communication with the sensor. The control system is configured to determine a guest state from the guest variable, and to modify a venue variable, for example by selecting a path a theme park ride follows. The control system modifies the venue variable according to the guest state to provide increased satisfaction to the guest of the experiential venue.