Can you provide more details? Otherwise you're going to get answers all over the place (including one country suggested in this thread that doesn't even have a Marriott LOL). Are you looking to relax on the beach? Tour museums? Go on wine & food tours? Hiking (I know a 75 year old who is an active hiker)? Do you want it to be within a certain number of hours flight from EWR? The answer to questions like those will allow FTers to make more precise suggestions.

Cheers.