From the U.S. State Department:

The Department of State alerts U.S. citizens to the potential for unrest in Tunisia. The security situation in most tourist and business centers remains calm. However, spontaneous and unpredictable events, such as work stoppages and demonstrations still occur, a state of emergency remains in force, and curfews can be re-established on short notice. The U.S. Department of State continues to advise U.S. citizens currently in Tunisia to remain alert to local security developments and to be vigilant regarding their personal security. Travelers contemplating trips to the interior of the country should assess local conditions and routes when making travel plans, as conditions can change quickly.

U.S. State Department Travel Warning