If you look at Celebrity's list of classic liquors and cognacs, they aren't very "occasional drinker" friendly: Campari (bitter), Galliano ("herbal", I actually read that you can substitute Ouzo or Sambuca for it), Hennessy (cognac), Kahlua (coffee, the most drinkable item here for a light drinker), Kirsch (cherry brandy), Licor 43 (described as vanilla, cinnamon - I have high hopes for this), Ouzo (anise), Romana Sambuca ( sweet anise), Southern Comfort ( peach whiskey), and Tia Maria ( coffee with vanilla)
So, in summary, two coffee liquors, three anise, a vanilla cinnamon liquor, whiskey, brandy, cognac and bitters.
I know there are also a variety of rums, vodkas, tequilas, etc.
BUT, when you don't drink very often, these aren't the greatest options. A lot of the ingredients for the things an occasional drinker would order are premium.