The sort of action you find in a novel determines the type of novel it is. Something by Anita Brookner, for example, has very different actions compared to a novel by Dan Brown, but both are full of actions.
But action in itself doesn't make for interesting reading. It has to be action with meaning, action that carries change with it. When you're starting out writing it's often easy to forget this aspect of action. Characters may be doing lots of things, but they can be staying in the same place, whether it's on a action filled journey that is just one event after another, never moving the story forwards, or a character hanging about thinking things over but never moving on.
I think it's also one of the reasons people get stuck at about 30,000 words. The initial burst of energy gets them quite a long way along, but then the action begins to dry up. Characters and the writing get stuck. The solution is to move the action along through change. Raymond Chandler is supposed to have suggested having a dame enter holding a smoking gun, Terry Pratchett suggests a naked woman bursting in brandishing a flaming sword. Not necessarily advice to be taken literally (especially if you're writing a contemporary rom com) but the point is to change the situation dramatically.
Action is also important in a writer's life. If you don't DO stuff, then nothing will happen. Doing means writing, then putting the writing out there (if being read by others is what you want). Even if you're famous you've got to make some effort (a celebrity once came to one of my novel writing classes, complete with an agent and a publisher, but was stuck at doing the writing - several years later, there's still no sign of a novel).
Do it, without fretting too much about the end result. Do it, get it done, and then fret - but do it first. As Goethe said, 'Action has magic and power in it.'