Forget holiday snobbery: you can do whatever you fancy on your summer break, so enjoy taking time to do whatever you feel like and forget about being cool!
So if you feel like devouring throwaway chick lit like Mills & Boon while you sip your midday Margarita, but you're worried about embarrassing yourself in front of the culture-vultures, leave them to their Dostoyevsky and Complete History of Zante and do exactly as you please!
Whevener you think you shouldn't be doing something you want to, simply ask yourself why. If the answer is 'What will people think?', you know you'll miss out if you don't do it! The only way to relax properly is to be yourself and enjoy doing the things you want to do.