Powder snow in Niseko is famous. Also there are many ski sites in Hokkaido. And you will find good quality snow. Many ski sites prepare rental ski and ski-wear for visitor.
If you stay in Sapporo and you want to enjoy ski, or if your trip starts
from Sapporo, there are some special package tickets for ski & snowbord.
Those package tickets are dealt by JR or Bus companies.
In Hokkaido, there are more than 30 lakes and there are 13 A-class rivers and more than 10000 rivers. Also there are 6 national parks, 5 quasi-national parks and 12 prefectural parks in Hokkaido. Hokkaido has several marshes as well. Those factors of nature give you a great experience of fishing.