If your resort advertises it is "no tips" or "tips included", it's entirely up to you, IMHO. The standard tip for dive ops (and regardless of whether you tip the DM or crew, they divide among themselves), is $10 for a 2 tank dive of AL80s, which works out to about 15% of the dive cost, generally. I tip $15 for 2 tanks for big tanks b/c ths reflects higher price. (And then usually something at the end that reflects the overall service for the entire experience.)
Then go crazy after that.... I think that small mom and pop restaurants (once you get off the melgar and high traffic restaurants) are very happy with even small tips. They are relying on repeat business from repeat visitors, unlike lots of the "tourist" restaurants that want "American" tips.
And as someone else noted, check your bill to make sure tips haven't been included. On my last trip, on my way back via Cancun, I stopped for lunch in Playa del Carmen. Although I was off the main drag, a tip was included in the bill. Fortunately a fellow traveller and someone fluent in Spanish (who, while initially sitting at another table but joined me when we discovered we had similar intrests) pointed it out to me.
My general view - don't overtip what the locals would provide (which is really minimal for anything outside diving) unless you've had SUPERIOR service. But that includes ALL the places where people have their hands out, which includes packing your grocery bags, "watching" your bicycle etc. etc. 50 cents for so for those "services".
Then go crazy after that.... I think that small mom and pop restaurants (once you get off the melgar and high traffic restaurants) are very happy with even small tips. They are relying on repeat business from repeat visitors, unlike lots of the "tourist" restaurants that want "American" tips.
And as someone else noted, check your bill to make sure tips haven't been included. On my last trip, on my way back via Cancun, I stopped for lunch in Playa del Carmen. Although I was off the main drag, a tip was included in the bill. Fortunately a fellow traveller and someone fluent in Spanish (who, while initially sitting at another table but joined me when we discovered we had similar intrests) pointed it out to me.
My general view - don't overtip what the locals would provide (which is really minimal for anything outside diving) unless you've had SUPERIOR service. But that includes ALL the places where people have their hands out, which includes packing your grocery bags, "watching" your bicycle etc. etc. 50 cents for so for those "services".