Yes, leave Udon on the Nong Bua Lamphu road - 210 - and after I think about 5kms there is a well signposted left turn. Follow that and later the subsequent signs. The last few kms involve a gradual climb - good for motorbikes. Free admission. There are plenty of parking areas when you get there. I would suggest the last one on the left. There is also a restaurant with good music.