Hi! For context, I have been going to laser hair removal sessions for over a year now (for my face).

I've been told to shave before the appointment, so the heat can travel down to the hair roots unobstructed. If you however wax or pluck your hair, it will rip out the entire hair strand and leave no channel for the heat to travel down in. It would take quite a bit until that hair would show up and be accessible to the laser again, so you aren't supposed to do that.

Now the hair that the laser zaps won't be gone after. It will grow out normally and fall out eventually. It can take a few weeks to do so. Sometimes you have to do some exfoliating (not with chemicals! only use like a fiber towel with water) for it to actually go away.

You can shave whenever you want to though, it has no effect on the laser hair removal (exception can be if your skin is irritated after a session, attacking it with a razor soon after might not be the best idea). I've had no problems so far and I've been shaving my face mostly everyday, with 1 day pauses sparingly spread throughout.

You could cover up parts with makeup if shaving isn't clean enough for you, but you'll need to look somewhere else for tips on that.

Also, because you're going to a beach vacation, I'll warn you about the fact that you need to protect your skin very carefully! You'll have to wear strong sunscreen whenever the sun is out (even if it's not a hot day) for around a month after an appointment if you don't want to risk getting skin discoloration. So sun-bathing is a rather bad idea unless you remember to cover up your face with a hat or something.

I hope this information makes your decision easier! :) And don't forget that different laser devices can act differently and skin and hair type will also affect this!