Where exactly is happiness?

Happiness is on the horizon. Or so it would seem from the numerous self-help manuals that I see when browsing. But a “horizon” is a mental construct that is always the same distance in the future. “I’ll be successful in another 3 years – when I’ve achieved the goals I set myself.” Why keep trying to reach a mental construct? Why not just stop – and enjoy the view from the beach you are standing on – and the surroundings you can see on either side? What’s wrong with here, now?