Arrange an early full-day coach excursion from Port El Kantaoui, ideally departing around 8:00–8:30; the short transfer to Sousse usually takes 15–25 minutes, depending on hotel pickups. Begin at the Ribat of Sousse, which opens in the morning and takes about an hour to explore. Climb the narrow stairway to the tower for excellent views over the medina, rooftops, and sea. Wear shoes with a good grip, and carry cash for the modest entrance fee—roughly €3–5.
Continue on foot through the medina to the Sousse Archaeological Museum inside the kasbah, allowing 60–90 minutes. Its Roman mosaics are the highlight, particularly the large mythological scenes, and the elevated position gives you another fine view across the city. The museum generally operates during daytime hours but may close briefly around midday or vary seasonally, so confirm your tour operator’s schedule; keep your ticket and avoid rushing the visit.
Have lunch at a simple Sousse Medina restaurant or café near the souks rather than at the waterfront. Look for Tunisian staples such as couscous, brik, grilled fish, or ojja; allow around €8–15 per person, with extra time for slower service. Keep the meal to about an hour, then rejoin the coach for El Jem Amphitheatre. The inland journey is approximately one hour each way, so this works best as a pre-arranged bus excursion rather than an improvised public-transport trip. Allow about 90 minutes at the amphitheatre: walk through the arena, underground passages, and steep seating tiers, imagining the scale of Roman spectacles. Bring water and sun protection, as much of the site is exposed and there is limited shade.
Return to Port El Kantaoui in the early evening and finish with an unhurried walk around the Port El Kantaoui Marina. The harbor’s cafés and shops are convenient for a drink, ice cream, or a light meal, and it is an easy place to decompress after the long coach ride. Prices on the marina are generally higher than in local neighborhoods, so expect roughly €4–8 for a coffee or soft drink and more for a full dinner. Confirm the exact return point and time with the bus operator before leaving El Jem, and keep a little cash for small purchases and toilets along the route.