Cold Coffee

Coffee or roasted coffee beans brewed in hot water, is the most popular drink that probably competes only with tea in the non-alocholic beverages category. Coffee being a rich source of caffeine it can help the human body overcome fatigue and improve physical performance and also lower risks of several conditions like Type II Diabetes, Cancer and Alzheimer's and Parkinson's disease.
Coffee liqueur is a popular and brands like Kahlua and Tia Maria are regulars in cocktails, but often brewed non alcoholic coffee is used in cocktails too, hot black coffee with Rum and whipped cream is what makes a Troical Coffee Cocktail for you, and being a caffeine rich liquid, it is a strange combination with alcohol since it tends to interact with the body and do just the opposite of what alcohol does, that it, tries to keep you alert and awake.

Sugar

Brown Sugar is a sucrose sugar with a distinctive brown colour from the presence of molasses, it is a partially refined or unrefined sugar containing sugar crystals and residual molasses giving it a distinctive taste and flavour of crystallised molasses or toffee. The taste of dark brown sugar is described as a caramel taste with a deep molasses flavour.
Brown sugar is used in cocktails where a caramel candy or toffee flavour is expected.

Caster Sugar is finely ground granulated sugar. It is not as fine a powdered confectioners' sugar and has a little grit to it. It is somewhere between confectioners' sugar and granulated sugar, and melts in mouth with a mild spicy feel to the tongue

Vanilla Sugar is the regular granulated sugar infused with vanilla flavour, by using vanilla pods and seeds to flavour the sugar. A home made alternative is to use vanilla sticks or pods in a jar of sugar and leave it sealed for 4 weeks to allow the vanilla flavour to infuse. Or to use granulated sugar and vanilla extract and blend in a mixer, although this ends up in powdered sugar.

Milk

Milk can do wonders to your regular cocktail. For a rich creamy cocktail, milk does wonder .You may argue that milk as it is made of fat, and being low in acid, will easily curdle if its mixed with alcohol.
Best way to get a rich and creamy cocktail is to use bourbon, milk will soften its whiskey flavour. If you are looking for some spicier yet creamy cocktail go for Scotch with milk cocktails, they'll surely set you holiday mood.

Ice Cubes

Ice is so obvious in most drinks, be it a straight drink or a mixed drink, that we often forget it's importance or even reason behind using a crystal clear good quality ice in a glass of whisky, or crushed ice in a tall glass to enjoy a cocktail.

Ice tempers a hard liquor, and as is in the case of whisky for example, if you prefer the flavours of whisky reach your nose without the hard note of spirit lingering around, or want to avoid the mild sting of a neat whisky, a cube of ice mellows the strength down a little and as it melts slowly, the aroma and flavour is released from the whisky slowly and makes whisky progressively weak, lingering and palatable.

Ice in Vodka helps release the little flavour a Vodka has, slowly, instead of letting the Vodka hit your nose all at once,

In mixed drinks, ice plays an important role in creating the perfect temperature a certain drink requires and bartenders use ice in several different ways, crushed ice for long drinks that will allow the cocktail to slowly water down like a Mint Julep, Moscow Mule, Rum Swizzle, Sherry Cobbler and other Tiki drinks, a large block or cubes of ice for drinks that are spirit heavy, such as the Old Fashioned, Negroni, and Manhattan

Kahlua Coffee Liqueur

Coffee liqueur is a liqueur produced by steeping roasted coffee, sugar and other ingredients in neutral spirit. The most famous coffee liqueur brands are Kahlua and Tia Maria, Kahlua has been made in Mexico since 1936.

However Kahlua has a thick buttery taste, that doesn't always appeal to the preferences of an alcoholic beverage lover. Which is why many people enjoy coffee liqueur made using their own home recipes.

Typical ingredients of coffee liqueur include liquor, espresso coffee, roasted coffee bean (and powder), sugar, and vanilla syrup.

The characteristic flavor of coffee along with over a couple of hundreds compounds contribute to the taste of coffee liqueur. Caffeine is a major ingredient of coffee, and also might be a taste factor that influences the complex flavour profile that appeal to coffee liqueur drinkers' palate. Reference - International Journal of Engineering & Advanced Technology (IJEAT)

NOTE: In the absence of a Coffee Liqueur like Kahlua or Tia Maria, to make cocktails with Coffee Liqueur, Coffee Liqueur Syrup can be used as a substitute with the proportionate alcohol substituted with a triple distilled neutral Vodka.