yes

Well, I spent 1 hour there mostly for taking photos and enjoying the view. But if you want to ride tractor or visit the alpaca farm then maybe 2 hours

Sorry for late reply. The flowers are gone by Dec and should have a layer of snow. Most farmlands may turn to snowland for snow related activities. Flowers are good from end June to mid August of each year.

2.3 kilos yes between 25 to 30 minutes, Taxi, im really not sure, the area is quite famous it will depend, fare, maybe between 1000 to 2000 jpy, I may recommend a day tour by private alphard van around 50 000jpy 9hours hokkaidotaxi com or the famous sapporo Chuo bus company for 7300 jpy for 10 hours, A last thing, Summer is short but sometime really hot up here, becarefull when you walk in this area as there is nothing around, bring water and phone hope that help ^^