^It's NCSO so, with the exception of black tiles, nothing foreign to the game would be put in.  And that which was downloaded is harmless; trust me, I never downloaded anything online but it's really fine for the game. 
Peeps don't enhance the game as much as you think.  You sound like it's a waste of time without peeps.  If I had the capacity of peeps in this park, it would have been a huge file and you'd barely get to appreciate it without massive lag.  Plus my computer is from 2002 so it's a miracle I was able to produce this.  It lagged without peeps. 
  
DOWNLOAD: http://www.nedesigns.com/park/3089/kidron-park/