You will quickly note that the doors in Lamu are works of art. And if you've ever been to Zanzibar you will see many similarities in the wooden carvings. Head over to the simple but informative Lamu Museum and get a "free" tour with one of the guys (who seem to work there?)
Lamu, being a major stop on the spice route has left traces of many cultures all over town - From Oman and Yemen to India and Europe. heading to the museum helps you understand what you're seeing as you walk around.