Pleasure and happiness are two different things, though both words are used to describe our feelings when certain things happen to us. Pleasure refers to a state of being pleased or contented with something. Most times, what gives us pleasure are things that come through our five senses, i.e., taste, sight, hear, touch, and smell. We feel pleased with everything that comes with our five senses.
For example, you can feel pleased just by seeing movies. On the other hand, Happiness literarily means the emotion of being happy. Happiness is usually a product of inner fulfillment. While happiness can be caused by circumstances, it is not totally dependent on circumstances. Happiness is something that comes from within.
That is why no matter how hard you try to please yourself whenever you are feeling unhappy, you will still find yourself going back to that state of unhappiness until what is causing that feeling is addressed. For instance, you might be pleased that a friend of yours offers you a ride, but you might still be feeling unhappy about something.