During vacation time we think that we have time off and can be care-free in what we do. We appreciate this special time that we can spend with our family and friends without the structure (and stress) of the chagim.
It is therefore a time that people around us subconsciously form opinions about us and learn from our examples.
Be careful: People are on your heels, watching what you do on your time off. This is the opportunity to set the עקֹב אחרי to the beis medrash.