The city’s green oasis extends more than 50 blocks, and New Yorkers use it as a playground and athletic field from early in the morning till late in the evening and in all seasons. People meet to jog, skate, and play baseball. Quieter spots invite strolling or meditation. There are free concerts in summer. Situated in an idyllic location on the lake, the terrace of the Boathouse Restaurant is the perfect place for a drink or romantic dinner.