Have to agree. Kyoto is not in day-tripping disance and definitely not a one-day stop. You can easily spend 5 to 7 days in the greater Kyoto area and still find stuff to see... I've been there twice in 5 years, both times about 5 days a piece and I'd go back...
Along the day-tripping idea, there's also the Chichibu national park area that's really nice... Nice caves and mountains.