Great experience
We enjoy alot with the guide & driver. Not just those assigned to us. We have a great time chatting with another fellow tourist ( he is on solo trip), his guide & driver. This make the whole trip more interesting then the Dzongs and temples. Just a suggestion: In your itinerary arrangement, you can actually ask the tourist are they keen to make new friends during their trip. If it is positive, how many time? this can add on some interesting experience.