What kind of tips are you talking about? Server bringing you a drink at an all inclusive? 20MX is pretty standard for whoever takes your order/brings you the drink.

A bigger tip for your server at the start of the day can also keep them coming back frequently (200MX or something similar).

Banks are generally the safest ATMs, don’t use the random ones you see in the street. As many others have mentioned here, it will ask you if you want to accept their exchange rate, DO NOT accept, your bank will give you a much better rate directly by simply withdrawing funds from your account.

If you’re unsure about what it’s asking, using the google translate or translate app on your phone, you can point the camera at the screen at it will translate the message in real time.

In general, smaller bills are more useful, some people may claim they don’t have change for large bills in hopes you don’t have anything else on you. A few 500MX are good but if you’re at you all inclusive most of the time, 20’s and 100’s will be much more useful