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.