The more flowers there are to trample and the less PWPs to get in the way improves your score! I'll rate your dream town 1 to 10 on its destructability!
I have no pwps (execpt Dream Suite (on Main Street) Reset Surveillance Center (you can run right over it) and Yellow Bench (small pwp, and it's really not in the way that much)) There's not many trees (but a reasonable amount of flowers). I know the low number of stuffs will hurt my score, but the little pwps will help.
Feel free to come and destroy mine. I made it for the purpose of letting my niece destroy it in a dream without actually destroying my real town so it should be a pretty fun experience from what she tells me. DA's in the spoiler so click and dream away lol