If it's raining cats and dogs, why not head to Museo Histórico? You'll be surprised just how much you can learn about the past here.
After you've seen all there is to see at this Guaimaro collection of historical artifacts, there are loads of other things to see and do in the area. Many tourists venture to Constitucion Park next. It's conveniently near Museo Histórico, so why not add it to your itinerary?