OVERVIEW: At the center of this West Marin community is an old town square, complete with its own Wild West saloon. It's home to some 600 residents, many coming from old dairy families that have lived here for generations. George Lucas holds forth at his Skywalker Ranch film complex not far away. The town also has a historic Catholic church, the popular Rancho Nicasio restaurant and plenty of rolling countryside. Most of the land is zoned for agriculture, but there are estate homes on many ranches, and developers have recently built more expensive homes.