I'm currently level 66 strength (61 attack and 60 defence) I want to know where the best place to train strength would be.

 

 

 

I want to go to at least 68, most likely more.

Giant spiders, third level of SoS dungeon. Bring tuna(or lobbies), and your best armor and wep.

Ok, thanks, I'll try it.

You're defense is too low for Giant Spiders. You could try it, but fact is you'll be much better suited at Flesh Crawlers until at least 75 defense. If you need a guide with exact what to bring/do, check out my guide, it's the second link in my sig, the first one that's not green.