3) (The most unlikely scenario) Have a computer genius friend who modded their game so everything is above level 1000. No joke...have a friend who did this. And just started their game in windshear waste...opened up the gun cabinet (first mission) and got over 5 million XP...instant level 50's across the board. lol
Do not need to be a computer genius, Just need a usb stick, a save, simple small program, and basic knowledge
The best PL spot I have found so far is in the Arid Nexus. From start to end is about 3-5 minutes. You have to save and end and then return for it to work, but with moxxi's exp relic I get about 35-40k XP in that 3-5 minute window. I run straight through to the loaders and kill them all on the way to Saturn. They are each worth 800-980XP depending on level usually. (Maybe more for lower levels) I then kill Saturn with a corrosive infinity or fibber. He is worth 25k-27k XP. I think the Pete's Bar quest gives about 30k or so in the same time frame. Its slightly faster to restart, but once you get a rhythm its a really nice way to power level. I leave the skags alone since they are worth only 300-600XP normally. If you can toss out a turret on the way by it may be worth it though.