To expand on DFC's views, use the hours to gain 'useful' experience and also try to develop good habits. Plan all your flights thoroughly, study the a/c manual, get a feel for aircraft performance. If you fly somewhere try to be as accurate as you can. If you plan for 90kts IAS then do not accept 85-95kts.
If you are cruising at 2500ft then do not accept 2450ft. Plan more complex navexs, get clearances through controlled airspace if you can. Fly the approach accurately and at the exact speed. Endeavour to always land on exactly the right point and on the centreline, generally always try to be as accurate as possible and it will pay dividends later on.
Develop skills, practice diverting using max drift and clock code. Set yoursellf tasks such as calculating a rate of descent from the cruise to reach a turning point as you level off. I am sure by now you are getting the idea. There are lots of thing like this which will make each flight a challenge, but it will also rapidly raise your skill level which flying up and down a coastline for the sake of getting another hour will not!
Oh and enjoy it!!!