If you're in Alexandria and know how to dive, you should take advantage of opportunity to dive off Alexandria's coast, by Pharos. Here you can dive, six to eight metres down, between sphinxes and colossal statues of ancient Egyptians. Here, among the ruins of the Alexandrian Lighthouse (one of the world's seven wonders), the Egyptians plan to build a submarine archaeological park, so people without diving skills can see what it's all about as well.
Find more attractions in Egypt here