The Lagoa is amazing. Spanning 7 km's, it is actually possible to do the tour in a little over an hour. On bike. There's plenty of people watching and a few park close by. Especially Shopping Lagoon in front of Flamengo's HQ is great for lunch (although pricey) with a stunning view. And also the childrens park ny the parking lot a little further ahead on Avenida Borges de Medeiros is so nice. And the "Quiosque Arabe" on the waterfront serves delicious arab dishes. You can rent all kinds of bikes and have great fun there.
The Eva Klabin foundation is situated by the Lagoon, ans so is also the Parque da Catacumba - Catacombs park.
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