World Monkey Park. Absolutely no tourists, but the place has monkey show, penguins, an evolution museum and monkeys you can carry and feed:

Pea-chan:

Behind St. Lukes Hospital in Chuo-ku (Seiroka as pronounced in Japanese) is a fanatstic playground. called Akatsuki Koen (??????):

Ohanami – Picnic under the Cherry Blossoms. Two weekends in a row with lunch by the river

Anpanman Museum in Yokohama.