Take the passenger ferry over to the towns across the harbor. It's cheap (3 euros?) and a nice ride and harbor tour. The ticket office is easy to find on the docks.
Another note of caution for airports: some years ago in the airport in San Sebastian I was the involuntary observer of a very heated discussion between a guy trying to check in with a cello and the ticket counter gal. It went on for a long time...
My wife and I took a one-day boat tour starting in Porto and then came back to Porto by train in the late afternoon as part of the package. No winery stops. I can't remember the boat ride end point, but it was a long day by the time we got back...
Everybody's laughing, but at my age a mechanical boost may one day make the difference between a nap in the La-Z-Boy or a hike in the woods. Let me remind you of Charles Barkley's profound observation: "Father time is undefeated." You...
If you don't sweat, never get caught in the rain or don't have to air-dry your clothes overnight cotton works just fine. But for normal mortals synthetic is best.
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