Visit the Park of Roses. especially in the summer time roses are all over the place and you can feel the sweet smell in the air.
The Central Park is very nice for its big trees which can give a cool shadow in the heat of the day.
Walk on the river's side. Trees and benches make your walk very pleasant. And if you want a romantic evening it's a good place: music coming from the open pubs, lights mirrores in the water, the sound of the river flowing ... it's just perfect.

