Hour building just "flying around" is worthless. Check out the CPL syllabus, get a plan of where to go then do it. You will progress more if you constantly set challenges and have an attitude of learning from each flight. It will stand you in good stead for later. You will probably want to review your plans when you have some solo navigation experience at the latter end of your PPL and can use nav aids properly, train first then just Go for it!