Plotter (free, iPhone) is a map app mixed with the benefits of social media. Before heading out for the day, you can plot your family's full itenerary on a map so you always know where to go next. Then, create paths so you know the best route to get there. Save each map in your own personal map room in case you need to reference it later.
And if you need recommendations, you can ask your Facebook or Twitter friends for ideas.