I liked riding my bike up and down the river here, before it got stolen. Nice city views, I guess you could also try to catch some fish?
A nice place to relax and look at plants
If animals are more your thing
For those of you with adventurous taste buds and the Peruvian homies. I recommend their Lomo Saltado, wash it down with some Chicha Morada if you want to eat like a real Peruvian
Get their cheese and pretzels! And beer.