Ambassador amenities are generally considered to be the water, fruit and movie. RAs get the addition of the free minibar. Benefits of Ambassador is a one-category room upgrade, of RA executive room or suite. Breakfast has never been a benefit of Ambassador (unless part of an upgrade to a Club IC roon/suite). Things like bottles of wine, are considered to be the Ambassador gift, which varies greatly from hotel to hotel, and sometimes is non-existent. However, the gift can also be a tray of cookies, a box or tray of chocolates, or an actual item like the porcelain tequila shot "glass" I received at the IC Presidente in Mexico City this weekend, or the box of fudge and bottle of Pinotage I received from the IC Sandton Towers in Johannesburg last month.
That said, I figure the free minibar is a pretty generous "amenity" for RAs.