I haven't had a beach-holidays in ages. I'm more a city-trip or nature/hiking-type of person. I also don't really do holiday-reads. I always read what I feel like...but assuming this question means vaguely 'books that require slightly less brain-power than average' then I'll go for Lokalkrimis a genre that I think exists really only in Germany and I admit that there is a lot of crap out there but inbetween there is some really great stuff like Helmut Vorndran who writes hilarious and engaging books.