Mojitos are a popular drink during Carnival: sugar, lemon juice, rum and mint. This bar is famous for them all year round, so during Carnival they prepare them in batches. This was one of the smaller batches!
One of the things I like about La Palma, is that people often have a few drinks, but it’s rare to see anyone downright drunk. There’s an article about this at http://lapalma-island.com/articles/drunks.php