I really, really don't want to make it into a poncho or anything like that. I like it how it is and I want to keep it that way, but if I could add some sort of string or hook to it to make it work effectively I will do so.I live in Alaska, and this time of year is ridiculously cold. I mostly just want something to wear around the house when I'm too lazy to wear ten layers of clothing while I surf the net and cook.
As Jim stated ATM's are the way to go and offer the best rate. Be sure to let your bank know you will be leaving the country as this could pose a potential problem with your card being denied. I agree with Jim in saying your worrying to much go have fun do not flaunt cash of course but wear what your feel comfortable in but DO leave the fancy jewelry at home if you can. If you look like a victim it is easy to become one. You won't have any issues in Acapulco if you act accordingly and are aware of your surroundings. have a great trip.
I will just deal with special relativity. All measurements we make in any inertial frame of reference may disagree with measurements made in a different inertial frame. Measurements of length, time, speed, mass, force and acceleration all depend upon the relative velocities of the observers making the measurements. There is no one right absolute measurement. ( except for the speed of light )
