My husband and I will be in Frankfurt the first week in April of this year. He will be attending a Tradeshow so I'm on my own for sightseeing during the days. I need to get comfortable with venturing out on my own, and would love some ideas for short day trips for sightseeing or local sights in Frankfurt that I should see. We are staying at the Radisson Blu - is that within walking distance to trains or easy public transportation? Would love some ideas and suggestions!