Hi Cascadian,
I think daytrips or weekend trips would be great, too. The season for enjoying the parks is nearly over, though, so maybe we could plan to continue to seek a car full of interested people for next summer!
I'm not keen on hitchhiking and will need to get to know people here before taking on even the carpool.
A trip or two to volunteer at an Animal Sanctuary might also be a good way to get to know each other.