The Barcelona card isn't a very good deal in terms of price unless you go to many if not almost all of the museums that give out discounts, but it does simplify making less purchases and just 1 on a Barcelona card.
This tour in Istanbul is a beautiful, quick view into the main focal points of the city. The locations are all interestingly unique from each other and the included lunch was delicious (they do have a vegetarian option as well). The tour guide was good and I'd recommend this trip to anyone who can only be in Istanbul for a day
This tour by boat is a beautiful look into the surrounding islands by Venice. Each island is different from each other and there is plenty of time on each to take pictures and get souvenirs, like Murano glass.