Here's an ideal itinerary for 5 days in Dar es Salaam:

Day 1: Arrival and City Tour

• Arrive at Julius Nyerere International Airport and check into your hotel
• Start your day with a city tour of Dar es Salaam, visiting the National Museum of Tanzania, Askari Monument, and the Kariakoo Market
• Enjoy a delicious lunch at a local restaurant, where you can try traditional Tanzanian dishes like ugali and nyama choma
• In the evening, head to Coco Beach to watch the sunset and enjoy the lively atmosphere

Day 2: Island Hopping

• Take a ferry to the nearby islands of Bongoyo and Mbudya for a day of relaxation and snorkeling
• Enjoy a picnic lunch on the beach and soak up the sun
• Return to the mainland in the evening and have dinner at a seafood restaurant in Slipway, overlooking the Indian Ocean

Day 3: Historical Tour

• Visit the ruins of the 19th-century Arab Fort and the nearby St. Joseph's Cathedral
• Take a short drive to Bagamoyo, a UNESCO World Heritage Site, to explore the Old Town and learn about its history as a slave port
• Have lunch at a local restaurant and try some of the town's famous seafood dishes
• Return to Dar es Salaam in the evening and relax at your hotel

Day 4: Shopping and Culture

• Spend the morning shopping at the Mlimani City Mall or the Kariakoo Market for souvenirs and local crafts
• In the afternoon, visit the Tingatinga Arts Cooperative Society to learn about the famous Tingatinga paintings and watch local artists at work
• Have dinner at a local restaurant and enjoy live music and dancing

Day 5: Beach Day

• Spend your last day in Dar es Salaam relaxing on the beach at Kunduchi or Mbezi Beach
• Enjoy water sports like jet skiing and parasailing, or simply soak up the sun and read a book
• Have a farewell dinner at a beachfront restaurant and toast to a wonderful trip to Dar es Salaam

I hope this itinerary helps you plan your trip to Dar es Salaam!