I'll collect scores tomorrow, keep votes coming in.

well i like the nice big courses more
so mine is going to feature all the big courses
10 -wario stadium , this one is fun because at the big jump i use a lightning to make everyone fall down easy victory
9 -mario circuit 2-snes this was the biggest snes course -- and my favorite due to the jump if you hit a cpu before they hit off the thing -snes version wont work in 3ds , -theyll miss the jump and have to go around similar to wario stadium but you dont need lightnings to do it
8 bowser castle gamecube- this one was pretty large and difficult , i find nearly all bowser castles to be fun but this one is my 2nd fav
7 yoshi valley- this one has so many ways you can go and its a mystery what position your in , adds to the challenge akin to the race drivin stunt track the out come depends on the route you choose at the beginning
6 rainbow road wii-rather frustrating but big l like big courses
5 rainbow road 3ds - love this one just like the wii its long and fun
4 rainbow road n64 -- possibly the longest rainbow road in history
3 wario collusium -gamecube so similar to n64s wario stadium youll think its a sister track
2 bowser castle nintendo 3ds , this track much like all other bowser castle tracks is long and has many obsticales
1 -bowser castle 64 -- this was my favorite bowser castle and what fitting is it that it is the longest bowser castle and my number 1 on this all time ten list

notable mentions-
kalimari dessert3ds/n64
rainbow road snes
bowser castle 4 snes
donut plains 3 - the 2nd bridge makes it a notable mention
toads turn pike
daisy cruiser
sherbet land-n64
sherbet land gc
vanilla lake 2
chocolate land 2 -snes
and finally bowser castle ds

Yep, I don't know why North America get's all the unispiring names though.

Neo Bowser City I acrually like more than the other names.

The top ten will be posted tomorrow, it was very close for 1st.