This cruise report provides a summary of scientific activities aboard the SSV Corwith Cramer during Cruise C-270A. This was an SEA Alumni Sail, during which SEA Semester alumni and their guests sailed from St. Croix to St. John and back, enjoying shore time in Francis Bay. While onboard the ship, the SEA alumni shared the experience of shipboard life with their guests. True to SEA and SEA Semester, they became part of the crew and stood watch, handled sail, navigated, steered, performed boat checks, and helped in the science lab and galley. Scientific sampling was conducted throughout the cruise in Caribbean Sea waters.