Sensual feelings can be considered the highways of happiness. Most people in a rich and industrialized nation can instantly get sensual pleasures. Whole industries make billions of dollars to provide us with pleasant tastes, eliminating unpleasant odors or replacing them with pleasant ones. Music is used to make shopping and waiting pleasurable. Art, architecture and landscaping is used to please our eyes, and jacuzzis or massages provide pleasure for skin and muscles.
Sensual pleasures are easy to obtain.
Emotions can be considered the state roads of happiness. We have a pretty good sense of what causes emotions, and we have some control over our emotions. We are sometimes free to interpret events in a desirable way, but there are limits to these interpretations. Getting fired means getting fired, unless one is George Gestenca who just shows up to work anyway. Furthermore, we are to some degree free to choose goals and to avoid goals that are likely to cause a lot of unpleasant emotions.