Lots of people love old maps. A 500 BC map, the Soleto Map was recently unearthed in southern Italy.
We have a special fondness for Ptolemy and his geography. His original maps don't exist, but he was rediscovered in the 1300's, and maps were made based on his descriptions in text. The beautiful map below is based on Ptolemy's coordinate system (before Descartes!). Ptolemy's maps would influence navigation for 1500 years, but his inaccuracies about the Earth's circumference (Eratosthenes was closer) were thought to be responsible for Columbus' underestimate of the time it would take to sail around the world. 
Maps are often an essential feature of many tales of fantasy and mythology. J.R.R. Tolkien used map throughout his books to make his worlds more vivid and his son Christopher illustrated many maps like the one below.
If you have spatially-gifted kids, they may love to explore the History of Cartography, as well as the high tech combination Google Earth / NASA plus sites like Flash Earth. GPS / GIS technology has excited today's students about Modern Cartography and some may consider cartography as a career.
If you have GPS, a fun summer activity is Geocaching with the kids. Here's another site with ideas for geocaching with your family and the official Global GPS Cache Hunt Site.
References:
Mathematics and Maps pdf
Ptolemy and his Maps at Wikipedia
Ptolemy's Works at the Vatican
Tolkien and Maps Cliff Notes Lord of the Rings
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