I have tried to secure bikes for a day or the weekend, while in town- Sept. 13 and 14th. I have not received any response from any company and I tried our hotel, which sent me to the rental companies. We would like to ride bikes either day to Schwetzingen, for the gardens, or have them for the weekend. Do I really need to secure them ahead of time? or will I be able to rent them once we arrive? We arrive by train...are staying at the Marriott....and leave by rental car on the 15th. it's the logistics of obtaining/returning that I am concerned about. Thanks for any ideas!!