Tuesday May 1st is a public holiday. Most shops will be closed. If you’re self catering, it might be an idea to stock up a bit today.
Thursday May 3rd is a local holiday in Santa Cruz de La Palma, Breña Alta, Breña Baja and Mazo. It’s Fiesta de la Cruz, and the roadside crosses will beautifully decorated on Wednesday evening. People have been making preparations for months. The locals will visit the crosses late on Wednesday night, although the crosses will stay up until Thursday evening. Again, most shops will be closed on Thursday, although only in the east of the island. (A few of the crosses in other parts of the island get decorated too.)
Finally, the road from Santa Cruz de La Palma to the Roque de los Muchachos is intermittantly closed for roadworks. They’re cleaning the cutting walls and the gutters around Los Andennes, where you get a wonderful view of the Caldera de Taburiente. The road is closed from Monday – Friday (but probably not public holidays) from 9 am to 2:30 pm. The road from the observatory to Garafía is not affected. If you’re going from Santa Cruz or Los Cancajos to the observatory via Los Llanos, Tijarafe and Garafía, allow at least two hours and half a tank of petrol.