Puerto Vallarta is a intriguing town to wonder around, but if you are going to gawk, be alert to where you walk. or you will find yourself doing the stub and stumble shuffle. Most of the sidewalks in the main tourist area are flat, smooth and well maintained. It is off the beaten path that your eyesight and agility are tested, especially at night.
As mentioned above, in the main tourist area the walkways are safe to navigate and wander, as evidenced by the last three pictures. Here one is able to be as graceful as one is able. A few steps with your favourite libation in hand and you are safe to navigate unscathed. If you follow the winding trail (small black stones embedded in cement) you are on your way safely.