What do palm trees smell like?

Pines manufacture a volatile compounds known as terpenes which have a characteristic smell. These are evaporated from the trees to produce both the pine aroma and the blue haze associated with pine or coniferous forests. Some insects and hops (for beer making) also produce these compounds.

The scent of pine is fairly similar to that of rosemary, if you're familiar with that.

Pine tree air freshener.