Planet Minigolf

Your best bet is to use the boosting thread and trade ratings with other users. You must create a hole, publish it, and have it played 100 times with at least a 3-star average rating. The rating only counts once per user, so you will need at least 6 ratings for your overall rating to appear (Thanks to L3via-than for the tip).

Once you have a rating of 3 stars or higher, to easily expedite getting to 100 plays, go to your hole, select "Give Up", accept it, then go to "Restart". Each time you Give Up, you get a score of 15, automatically finishing the hole. To get the trophy to pop once done, go back to the "My Courses" and "Publish Hole". This will show your holes at a glance, which should have 100+ plays and at least a 3 star rating.