Walk down the south bank of the Thames if you want a nice stroll to see some of the big tourist bits (parliament, the eye etc.), and visit the Science, British, Imperial War and Natural History museums if you have time- like most museums here they're completely free, and some of the best I've ever visited.
As for the general rules, most people will be happy to give directions, ignore the guy who said you'll piss people off. That being said, talking to strangers without purpose is something which doesn't usually happen here, so people might think you're a little odd.
Ask someone when you get there which parts of town to avoid and you'll be fine, same as any large city.
Final point, a lot of the funny looking guards in the silly hats were probably in Afghanistan shooting at people a few months ago, and will be back there doing the same before too long. They are highly trained soldiers, don't mess with them (what, you thought we'd guard the royal family with glorified tourist attractions?).
London is one of the greatest cities on earth, so have fun.
As for the general rules, most people will be happy to give directions, ignore the guy who said you'll piss people off. That being said, talking to strangers without purpose is something which doesn't usually happen here, so people might think you're a little odd.
Ask someone when you get there which parts of town to avoid and you'll be fine, same as any large city.
Final point, a lot of the funny looking guards in the silly hats were probably in Afghanistan shooting at people a few months ago, and will be back there doing the same before too long. They are highly trained soldiers, don't mess with them (what, you thought we'd guard the royal family with glorified tourist attractions?).
London is one of the greatest cities on earth, so have fun.