Our Story If you are looking for a true San Antonio venue space for your rehearsal or reception Prost River Walk & Alchemy Bar is the place for you! Prost is set right on San Antonio's very own Riverwalk with one of the most unique aesthetics you will see. his stunning backdrop not only enhances the overall ambiance but also provides a perfect foundation for your florist and decorators to build upon. Prost is a full-time restaurant, ensuring they are one of the most trustworthy choices for your dinner services. Whether you're envisioning an intimate gathering or a grand celebration, Prost River Walk & Alchemy Bar promises to deliver an unforgettable experience with impeccable dining.