Just as with planning with cash, I plan with gift cards. Since I can get 5% off with my Target Card, I buy enough to pay for my resort reservation and my expected dining. I've done really well so far. I've been able to use up my GC's each trip and then only had a few out of pocket expenses (or sometimes none) at the end of my trip. Each receipt shows how much is left on the GC. That may be more planning than some people wish to do, but I like to save that 5% and also pay for my trip ahead of time (I purchase GC's over time leading up to my trip).
I think it's more difficult for the OP since they don't live in the US so GC's may not be available until they arrive. Hopefully paying by MB works. I don't believe they let you "put money" on your mb account. You charge it and then pay it off. Just a reminder--pay off any charges the day before you check out or they may charge it to your cc on file early morning on checkout day! Also, depending on the resort, they may charge a cc when they hit a certain threshold. You may want to pay off several times during your stay if you plan to charge a lot to your mb.