Nature itinerary — Evros Delta & Traianoupolis
Start with the boat tour while the birds are most active in the cooler morning hours, then use the drive back toward the city to stop at Traianoupolis — the Roman ruins and thermal springs sit almost directly on the route between the delta and Alexandroupolis.
This is a half-day-plus-extra rather than a rushed morning trip — budget the whole day if you want time at both stops without feeling hurried, and check the hydrotherapy centre's current status before planning around the baths specifically.