Sue:

I do not think so because it is a local holiday. Today, Sunday, is a national holiday. Since it falls on a Sunday, the local authorities have declared tomorrow a local holiday in Malaga. Most everything, except restaurants, will be closed.

The park will be open and you can have a nice walk there, if it does not rain. You can also walk to the Malagueta Beach, close to the port. You can also take a look at Calle Larios, the downtown shopping street.

In my opinion, the city should allow some stores to be open everyday, especially for tourists like you.