Do I need to have any special equipment?

No. Most items including essential safety equipment (i.e: lifejacket/buoyancy aid) can be hired. Beyond that, all you usually need for dinghy sailing are appropriate waterproof clothing to keep you warm and dry, and shoes with non-marking soles to wear on the boat.For longer trips you can buy specific sailing gear, but it can be expensive and is probably not worth the investment unless you are going to be sailing regularly. For normal dinghy sailing lots of layers of old clothes and a waterproof jacket should be fine!