I'm going to be controversial and say only go to Winter Summerland if you've got kids. Most of the holes are very generously sloped - i.e. hit it in roughly the right direction and it'll roll towards, and sometimes even straight in the hole. Don't get me wrong, it's a very nice and well themed course (especially the holes with the 'secret' water jets!), but personally I like my mini-golf with a bit more of a challenge to it.
That is why I prefer Fantasia, although as a previous poster said, there are one or two bits on the course that could do with a little TLC - showing it's age (wear and tear) in a few places.
However if you fancy taking a trip out to I-Drive, there is now a MASSIVE amount of mini-golf choice. I make it now a grand total of 162 holes across 5 different venues - Pirates Cove and Congo River have been open ages, but new in the past 18 months are Putting Edge (indoors with neon lit holes), Tiki Island and Hawaiian Rumble (both with giant volcanoes). Can't wait to play them all this November!