A personal watercraft (PWC) is disclosed that is convertible between a stand-up type watercraft, and at least one of a straddle-type watercraft and a sit-down type watercraft. The PWC includes a hull supporting a power source, and a deck, the deck supporting a steering handle support assembly. A seat assembly is removably supported by the deck, such that the seat assembly can be selectively removed by the user so that the personal watercraft can be operated with and without the seat assembly.