Likely the people get bored first. If they actually have free will, they will start experimenting with Mary Jane, and of course alcohol.
How much alcohol will a person be allowed in the new order before they are 'sinning'? Or will they be allowed to form competitive sports leagues, or even play board games competitively? Or, as Data Dog mentions, a little sexual experimentation - will that be allowed? We all know how much God dislikes Oral already!
You can only take so many picnics on the rolling green grass hills of paradise before you want to take your own life out of sheer boredom.