Tourist beacons are either orbiting, or on the surface of, a specific planet or moon in the system. If you've scanned the Nav beacon, and can't yet see the tourist beacon on your Nav panel (perhaps because it's too far away), you should at least be told which planet to head for.
If it's a surface beacon but your ship doesn't carry an SRV hangar, you can still scan the beacon from your ship when you're close.