My wife and I want to do a 3-4 day stopover in Japan on the way home from China. We have been to Koyoto before. The JR cost is $130 USDs pp each way from NRT to Takayama. We are considering renting a car and self drive. Is that practical and would parking be an issue in Takayama? The costs for self drive appears to be considerably less? Are they any drawbacks to going this way?