Alexandria is a beautiful city with a rich history and culture. Here's an ideal itinerary for 3 days in Alexandria:

Day 1:

• Start your day with a visit to the Bibliotheca Alexandrina, one of the largest and most impressive libraries in the world. You can spend a few hours exploring the library's collections, exhibitions, and museums.
• After the library, head to the Citadel of Qaitbay, a 15th-century fortress that was built to protect the city from invaders. The citadel offers stunning views of the Mediterranean Sea and the city.
• For lunch, try some traditional Egyptian food at one of the local restaurants in the area.
• In the afternoon, visit the Alexandria National Museum, which houses a vast collection of artifacts and exhibits that showcase the city's history and culture.
• End your day with a stroll along the Corniche, a beautiful waterfront promenade that offers stunning views of the sea and the city.

Day 2:

• Start your day with a visit to the Catacombs of Kom el Shoqafa, a fascinating underground burial site that dates back to the 2nd century AD.
• After the catacombs, head to the Montazah Palace Gardens, a beautiful park that features stunning gardens, fountains, and a palace that was once the summer residence of the Egyptian royal family.
• For lunch, try some fresh seafood at one of the local restaurants in the area.
• In the afternoon, visit the Roman Amphitheatre, a well-preserved ancient theater that was built in the 2nd century AD.
• End your day with a visit to the Abu al-Abbas al-Mursi Mosque, a beautiful mosque that was built in the 18th century and is one of the most important religious sites in the city.

Day 3:

• Start your day with a visit to the Alexandria Aquarium, which houses a variety of marine life and offers a unique glimpse into the underwater world.
• After the aquarium, head to the Alexandria Opera House, a beautiful building that hosts a variety of cultural events and performances.
• For lunch, try some traditional Egyptian street food at one of the local vendors in the area.
• In the afternoon, visit the Pompey's Pillar, a well-preserved ancient column that was built in the 3rd century AD.
• End your day with a visit to the El-Mursi Abul Abbas Mosque, a beautiful mosque that was built in the 13th century and is one of the most important religious sites in the city.

I hope this itinerary helps you plan your trip to Alexandria!