I've already mentioned -... by apfear
I've already mentioned - Public Market and the boat trip on the river.The public market is not at all touristy. The boat trip gives you an oportunity to see how the very rich and the very poor live in PoA. It lasts about an hour and a half and takes you around the small islands in the 'river', which is really an estuary. The sunset trip is the best time, for obvious reasons. There are also night time trips and Saturday or Sunday lunch, which is excellent ( a friend of mine does the catering!). No Guinness though.