To remove the fog from the map you'd have to open the snowy parks .scr file.You'll have to search around in the file for level.fogplane=a number
Where it says a number put of a course,a number.The higher the number is the less dense the fog is.So I'd try putting the fog to 9000 or something.
Go here if you need more help
http://users.1st.net/kimberly/Tutorial/fog.htm