What does Ecclesiastes 2:4 mean?

I said in my heart, “Come now, I will test you with mirth: therefore enjoy pleasure”; and behold, this also was vanity.

I said of laughter, “It is foolishness”; and of mirth, “What does it accomplish?”

I searched in my heart how to cheer my flesh with wine, my heart yet guiding me with wisdom, and how to lay hold of folly, until I might see what it was good for the sons of men that they should do under heaven all the days of their lives.

I made myself gardens and parks, and I planted trees in them of all kinds of fruit.

I made myself pools of water, to water from it the forest where trees were reared.

I bought male servants and female servants, and had servants born in my house. I also had great possessions of herds and flocks, above all who were before me in Jerusalem;