Received A Powerbook G4

I received an old powerbook g4 from my aunt who doesn't need it anymore.
But the best I can get out of it is a nice internet connection and nice movies, since it has a big screen.

Is there any chance that I can upgrade my system somehow to get the best out of it, or am I just stuck with basic internet surfing and porn? I wish that I could install software on it without telling me that it's too old :/

here are the specs:
Machine Model: Powerbook G4 15"
CPU Type: PowerPC G4 (1.1)
Number of CPUs: 1
CPU Speed: 1.5 GHz
L2 Cache (per CPU): 512KB
Memory: 512MB
Bus Speed: 167 MHz

P.S. tutorials, links to tutorials etc please

 

You could easily add more RAM, but I don't think it would even matter. Watching movies and light internet browsing is about the extent of it's capabilities.