Don't imagine there is anything very exciting there. Was in Lanzarote last year and only came across Dorada and Dorada Speciale (so so), Tropical (brewed in Gran Canaria) and most common Spanish macro lagers. Some supermarkets have some German beers, bud etc etc, the odd English bar having John Smith's bitter but other than thst nothing wildly exciting.
As for microbreweries - forget it!!!!!
Have a good time!!!!