Sight
Sound - What types of music do they play in this location? Borrowing a CD from the library (or finding an online radio station) of traditional ukulele music creates the perfect background for your at-home Hawaiian luau for two.
Taste - What foods and drinks do you and your partner enjoy from this culture? You can cook or pre-purchase yummy appetizers or an entire meal based on food from your ideal romantic getaway location. If you've set your sights on the Caribbean, why not plan to make some tropical cocktails to help set the mood? You can even get those cute little paper umbrellas for a special touch.
Smell - This can usually be accomplished through whatever food or drink is involved in your plans, but can also be accomplished through scented candles or incense. If your romantic location inspiration is a camp-out in the woods, a pine-scented candle can help you escape the walls of your house or apartment (making some no-fire s'mores might be fun too!).
Touch - This can include the textures you use to decorate your room or even what clothes you choose to wear for your romantic evening.