I used to fly in a pretty dense traffic area in Oz. About 20 or so aircraft following a VFR scenic pattern around a lump of rocks known as the Bungle Bungles. There would be Chietains, Partenavia's, C208's, C210's, C207's and float aeroplanes all mixing it up. Don't forget the helicopters too.
Come to think of it the circuit at Kununurra was entertaining too.
Now we were mixing it with Twotters, F28's or Bae 146's.
No tower. No radar.
As far as I am aware there hasn't been a single mid air in over 20 years in that area. Why? Good situational awareness. Instead of being dazzled by fancy gizmos in the cockpit we had to keep a bloody good look out. We were also flying at a comparatively low level too. This made it all the more imperative to look out.
A mental picture of who was where was maintained by effective use of the radio.
A main point was while we had to give an effective commentary and to look after the pax, that did not detract from flying the aircraft. (In other words, don't let the passengers interrupt high workload times)
LARS/TCAS are tools. If you don't keep a good and effective look out with assistance from the radio then the tools aren't going to be much chop.
Keep a good idea of where you are in relation to obvious waypoints/aerodromes. Use the radio wisely to keep a mental picture of what's going on. Write down the traffic if you're not sure. Plan your route to avoid known hazardous areas such as training areas/gliding areas/ultra light areas/parachute DZ's.