Seba was a great host and I highly recommend his sailing tour. It is definitely a unique experience. He speaks both English and Spanish and is full of interesting facts about architecture, soccer, and food . He arranged a pick up place and train tickets to get us from Retiro to the marina in San Isidro (approximately 45 minutes to an hour). He also ensured that the conditions were safe for our day out on the water. You may have to be a little flexible as trips depend on the tides & wind, which vary daily. You may also want to bring snacks for the boat ride. We spent about an hour on the river before heading back into the city for a wonderful lunch at one of his "special spots." If you are lucky, he'll even show you his favorite building in all of Buenos Aires and give you insights on the best pizza spots in the city.