We had a great week at Grand Muthu Cayo Guillermo.
It is a newer resort with modern furniture decorations. Mattress is comfortable to sleep on.

Beautiful beach... many shades available.
when low tide..while in the water, you can walk to the left side of the beach to find some conches .. I was lucky to find a huge one.

Plenty of food in buffet.. no coca cola, even Mate drink ran out after a few days the week we were there.

we like the location of Building #5 ... but WiFi signal can't reach to the 3rd floor.