I'll be visiting Heidelberg, Germany for a short business trip in Early June. Below is my itinerary and there's some free and easy slot which allowing me to visit places of my choice. However due to limited time, I only able to choose among few places nearby. Appreciate if you could give me some suggestions.
01 June: Arriving Frankfurt airport early in the morning. Free and easy
02 June: Free and easy but I need to report myself at Heidelberg at 18:00
03 June~05 June: Working during daytime. Heidelberg city tour and Neckar Cruise in the evening.
06 June: Free and easy
07 June: Leaving to another city from Frankfurt airport.