Strolling along the sinuous paths of Parc de la Ciutadella is a lovely way to spend a sunny afternoon. The park is full of families, kids, and, of course, puppies. The fountain wasn't running during my visit but it was gorgeous none the less. Make sure to climb up to the top to get a great panoramic view of the park. And don't miss birdwatching or paddle-boating around algae-green lake.