Leaving the country is not the issue. The issue is whether the country you are going to will let you in. Canada for example considers DUIs a felony and has refused folks entry to the country. Your best bet would be to consult with the Guatmalan consulate or embassay regarding their requirments long before you spend the money for the trip. If you have completed probation there should be nothing from the US end that will prevent your exiting the country.
This information does not create an attorney /client relationship and should not be use or relied upon to make any decision in your case. Only consultation with your own attorney can provide you with the advice you need for your case.
You are allowed to leave the country without a problem. However, the real issue is whether the country you want to visit will allow you entry. Best thing is to contact their embassy and find out if it would be a problem.