The Paseo de Santa Lucia (also called the River Walk, in English) is a charming way to get from the museum area to the very large Parc Fundidora. A cheap boat ride will save you the walk along a pleasant artificial canal, although the walk itself is also pleasant. Near the museum end there are some riverside tables and restaurants and there is a steady stream of locals walking around dusk. A nice place for a snack!
Take a walk thru the 'Paseo Santa Lucia'
Is a artificial river at downtonw,that let you walk next to it, and relax. Is a good walk in the day, but if you want to, can be a romanitc walk if you go there by night.
You can rent a little boat too, to go over the river, is not to long, but can be fun.