I would suggest you mussoorie, if you guys love to have adventures. You can start your first day with Kanatal and dhanaulti and can cover Tehri Jheel adventure 0in 2nd day. its beautiful weather out there in these days.
Hey Since you are from Delhi and planning a trip for 2D/2N I would suggest Rishikesh will be the best place for the trip to your employees because it is only 5-6 Hr journey so you will save on time and money both. Second Reason Rishikesh is perfect combination of sightseeing and Adventures. Your employees will love to do campaign where they can enjoy sports like Bollyball, Dj Night and Camp Fire. Next you van do River rafing with your employees. All these activities required team work and when they all will enjoy these activities it will help you to create strong bond in them and it will surely help in the productivity when they will return back to work. Drop me a text if you need any help in making arrangements for your trip.