My wife and I are "youthful seniors" which means that we are fit, active, open minded..... We've spent perhaps 150 days in Europe on maybe 18 trips over the past 20 years, mostly in France and most of those involving a few days of business. We avoid tourist traps and prefer to mix with the locals, enjoying food and drink and the under the radar sights. I'm a musician (harmonica) and we seek out bars and clubs where I have often played as a guest with the bands.
My wife will be in Mannheim for four days (via Frankfurt) in about a month and we have yet to decide if I will join her.
So, I'd like to know if there is enough in and around Mannheim to keep us busy for about a week after her meetings end. We generally don't like day trips and don't like to move around where we might switch hotels after a day or two.
I welcome your suggestions.