An esthete is someone with good artistic taste, a person who appreciates beauty. If you're an esthete you can easily spend an entire day wandering around an art museum.
Esthetes tend to be especially sensitive to beautiful things and skilled at seeing the beauty in the world. If you're an esthete, you might carefully set the table with flowers and lovely plates every night before dinner — you might also spend hours admiring the color of the sky and the shape of the clouds. You can also spell it aesthete, from the Greek root aisthetes, "one who perceives."