Swedish company Point 65, best know for their modular kayaks, recent released a line of modular SUPs. For the past few weeks, I have been playing with the Rum Runner 11.5 in the waters around the Bay Area.
You don't have to wear shoes when stand up paddleboarding or participating in other water sports, but I prefer to do so. Not only do they protect your feet from rocks, coral, and anything else sharp (or stingy!) beneath the water, but also mean you are instantly prepared to tack on some hiking, biking, or touring for a multi-sport adventure.