Put the Cádiz weekend after the study week
Atlantic coast, old town and harbour culture need a clear return plan. Fix classes, coursework and rest first; select one activity whose distance, opening status and weather fit rather than turning a weekend into a checklist.
One adaptable culture route
Use an old-town, market and seafront walk or one officially open cultural activity; do not rush every element into the same period.
Travel and return
Check rail or coach return from Seville or the actual campus, including late connections and transfer buffer.
Weather, nature and safety
Wind, sea conditions and sun can be significant; follow beach and municipal notices and protect belongings at night.
Four checks before leaving
Confirm official opening or reservation status, real return transport, weather or sea conditions, and companions plus emergency contacts. Current operator and venue notices govern access, timing and safety.