Ah HA! There IS a way you an test to see if changes need to be made for peeps. When you're ready to let the little createns in, just save the park, and open the gate9s0 via trainer. Save the game under another version, (I do numbers for normal saves and letters for peep versions.) Let the peeps screw the place over and find out where they gather when they get "lost". You can then figure out how to relieve the congestion, then duplicate that correction in the last peepless save.
That - or something similar - is fairly common practice.