Yes, evenings are probably better for nicer pictures of Lake Toya from Shikotsu observatory. Best time would really depend on the season though as the days are longer in summer than winter, for example.

thanks for your questions. There are two kinds of public transportation from Toyako Onsen town to "Silo Observation Deck". It is a bus and a taxi. If you use a taxi, you can arrive in 15 minutes with about 3000 yen each way. If you use the bus you will be using regular buses with 6 flights per day. I think that the detailed bus time is posted on the tourist association's page that you search by "TOYAKOONSEN" and hit, please check there. Thank you.

Dear Guest Thank you for your inquiry about bus schedule. You need reservation to have a seat .If you want to make a reserved,You need call to the bus company which is Donan Bus only .Telephone number is (0142)75-2351 No online service.