Good question. I read "trashy" books on and off throughout the year anyway, but they are especially nice on the holidays when I'm feeling a bit lazy. Since I am moving house soon and will be very busy I deliberately kept out a couple of "easy" escapist reads that I might dip into for a break when I'm stressed out. For me that's some Mur Lafferty (specfic/comedy) and a couple of romances.
I really enjoyed Crazy Rich Asians by Kevin Kwan as a totally escapist beach read. On holidays I like to read things that feel really indulgent and separate from my own world, and this sneak peak into the world of the insanely wealthy really provided that.