Port Said isn't a tourist entry point and so doesn't issue tourist visas. If you're an Africa overlander with a vehicle and have managed to find a Ro-Ro service from Europe or Turkey that arrives in Port Said, make sure to have purchased an Egyptian tourist visa in advance.
Port Said was declared a duty-free port in 1976. In theory, everyone must pass through customs when entering and leaving the city, though in practice this is seldom enforced. Regardless, be sure to have your passport with you.