We're deciding to extend a last minute business trip. 2 adults, would like a mix of nature (we love hiking & biking) and quaint towns/villages, maybe a couple of castles/ palaces but not too many. We are in the area for 7 days between 8/18 -8/24. Flying in/out of Frankfurt. Work is based in Freiburg but we want to travel around a little bit. Based on cursory research the following options look interesting.
* A day or two in Freiburg
Any other places we should consider in addition to or in lieu of the above? We love taking public transport but wondering if it makes sense to rent a car to drive to France and for that part of the trip.
Any advice on accommodation - hotels vs. Bed and Breakfasts vs. AirBnB? I plan to do some more research but would love any advice or thoughts, especially given the short notice.
Thanks very much in advance for any help!