Some perks aren't marketed to the general public.
As a way to deter guests from taking advantage of their free perks, 5-star hotels will keep from advertising all they have to offer, according to Business Insider. Free upgrades and complimentary breakfast and champagne are just a few examples of perks that are fair game, but often not advertised to guests.
To access these extras, make sure to tip well and buddy up with your concierge.
[Photo via @thefloralaw]