Other sidewalk/street hazards:
1. Missing manhole (er....access hatch) covers. Probably missing for the same reason the sewer grates are...
2. Water meter pipes/hydrants which protude 2 feet into a 3 foot wide sidewalk
3. Chunks of masonry falling from buildings. Yes, it does happen with amazing frequency; you not only need to look down, but also look up as you're walking.
4. Beggar k*ds lying in the path, trying to appear asleep but actually a gringo trap...
5. Motorists who neither understand nor obey traffic laws, and even if they did, the pedestrian does not have the right-of-way.
6. Aguardillas, or can~os...these are the troughs next to the curb which direct rain to the storm drains. They vary widely in depth and width, and I have stepped into some as deep as 18 inches. Here's a good example: The calle running in front of JetSet and VIP's #1 has a very high center crown, then slopes downward into very deep drain troughs. Even if you're sober, it's incredibly easy to snowball down the street from center line to curb, then trip/fall hard into one of the canos.
7. Bang Bang 57's leftovers
Seriously, as a blind walker, I literally take my life in my hands when I walk the streets. I have so far (knock wood and cross fingers) avoided serious accidents.