Trip to Switzerland

Hi ,

We are a group of 8 adults visiting Switzerland from Dubai ; we land at Geneva airport on August 3rd , stay the night there and then we have only 3 full days before we head back on 7th. We have hired a car from 4th August and will be driving for the 3 days. We are staying in a bnb in Rohrbauch (Bern) Ideally less than 2 hours by car to most attractions.

I am looking for a good itinerary ; we like nature and are looking forward to soak in as much greenery as possible , small town visits , a lake cruise and probably one mountain trip . Realize that 3 days is too less but request recommendations.