Thankfully, never any serious injuries while in Jamaica, which is amazing.
HOWEVER, after some near disasters, I have learned that:
Unless you have Cirque de Soliel training, it's probably best to leave high heels at home - flats are the new "Sexy" (since traction is definitely NOT)
If travelling with NEW shoes, polysporin and bandaids are a Godsend and don't take up much luggage space
If you aren't planning to listen to the locals tell you that a dish is SPICY, you might want to carry some Tums
If Jamaicans put up a Caution or Danger sign, there is probably a REALLY good reason, and you should trust them and not investigate "but why, I wonder ....?"
Water shoes are a good idea (even if really ugly) - rough seas bring in creatures usually out way past where you would normally walk, and having a good looking life guard pull
thingies out of your feet is not a cool way to meet people .....(or so I have heard, you understand .... I have no personal experience in this matter ..... seriously, I don't)
Listen to the local Jamaicans when they say "just hold still" if a stink bug has landed on you. Freaking out and jumping up and down and screaming "getitoffmegetitoffmeGETITOFFME" is not the best or healthiest way to go (again, I am just saying what I have heard! I have NEVER had a crowd of Jamaicans around me laughing at such a situation! Seriously, I don't!
Overproof rum is good as a mosquito repellant; stomach stabilizer; headache cure; after-bug calmer downer; and generally good for the soul!

Just my observations!