Just a bit of background....
We have cruised with NCL once, around a dozen times with Thomson and this is our third time on Oceana. This is more of a comparison between P&O and Thomson than a review.
We are a middle aged couple also travelling with an older couple one of them is in a Wheelchair. As we were in 2 cabins I list the details here.
Walked to train station took 20 minutes, got 2x 2x singles to Caiscais from ticket office, took 45 minutes, had a nice walk around Caiscais then walk along front to Estoril and got train back
Cadiz is lovely, just walk around, no need for HoHo bus. Go in the Church next to the Cathedral it's full of gold and try to find the Holy Cave Church.
T4 port bus (€3 return) to bottom of ramblas then metro up to Nou Camp, was there for 10am. Many from P&O didn’t know about port bus as were getting stung for £4 singles on their shuttle. Nou Camp tour was brilliant, a really good Museum (Man U could learn a thing or two) it got very busy, were in around 2.5 hours, could have spent longer really.