Say what?! You’re probably thinking along the same lines as the English teacher I had during a home stay in France: poor girl has forgotten her English. (Truth: I hadn’t then, and haven’t now.)
In Japanese, “windsurfing” is indeed spelled with a “う”, but with katakana—> ウインドサーフィン, and if romanized, would look like this: uindo saーfu(tiny “i”)n.
Kamakura is a great place to come to enjoy water sports. Year round, you’ll see surfers (regardless of whether the waves are any good), SUP-ers, kayakers, boaters, and windsurfers; and during warmer months, swimmers, and people enjoying personal water crafts like Sea-Doos. A handful or so of rental shops are within walking distance of Yuigahama beach, from the Zaimokuza side to the Sakanoshita side and beyond towards Shichirigahama and Enoshima, and offer lessons.
If you’ve got the time and inclination, Kamakura offers visitors the chance to experience more than just history. Make your trip an overnighter (or more!), and enjoy a wide variety of activities.