Morocco is a popular destination for solo travelers, especially backpackers. Moroccans are very friendly, and traveling alone amongst them on public transport has brought about many memorable conversations and experiences. If at any time you would prefer some company or a traveling companion, there are always plenty of fellow travelers around, especially in Essaouira, Fes, and Marrakech. Single female travelers may encounter some harassment, however.
On package vacations, single travelers are often hit with a "single supplement" to the base price. To avoid it, you can agree to room with other single travelers or find a compatible roommate before you go from one of the many roommate-locator agencies.
TravelChums (tel. 212/787-2621; www.travelchums.com) is an Internet-only travel-companion matching service with elements of an online personals-type site, hosted by the respected New York-based Shaw Guides travel service.
Many reputable tour companies offer singles-only trips. Backroads (tel. 800/462-2848; www.backroads.com) offers "Singles + Solos" active-travel trips to destinations worldwide.
For more information, check out Eleanor Berman's classic Traveling Solo: Advice and Ideas for More Than 250 Great Vacations (Globe Pequot), updated in 2005.