cozumel 2019

Probably the nth time this has come up, but asking since I dont see a lot of new (and relevant) datapoints. Which place is better to get open water certified? I know it depends on the scuba instructor/school, time of year, things you want to do etc. But in case we take most out of the equation...

I'm breaking in a new set of X-treme fins with a 3 mm size 9 boot. (size 8.5 shoe) Been swimming in the pool every few days and after each dive, the top of my foot hurts like mad. The area shown in the image. (i'm a warm water diver once a year, cold water the rest of the time. Used to...