2nd vote for tour on what you have (if it's suitable).
My other half and I did a 3 day trip to the Isle of Wight with Axiom Streamliner racks and 30 litre panniers. I was on an Allez, she on a steel Ribble road bike.
Swapped out the rear for a 28s tyres with a bit of tread, and the front to 25s.
Loads of fun.