You could also call the salon and ask if they will open early for you. I do this sometimes. Because I tip really well (about half the cost of the manicure) and I’m a regular they have done it for me once when my flight got changed.

Or, get them done on vacation! Mani pedi!
Also have you tried SNS? Better than gel if you ask me.

honestly i would just ask. the worst they can say is no. what if you were able to get your nails done the day vacation starts? hope everything works out :)