Rule 1. Always trust my "gut feeling", if something doesn't feel right it's probably not...
Rule 2. If a local approaches me and offers me something I will at least investigate the offer unless
a. I really don't need what they are offering or
b. to take them up on their offer it involves getting into a car*, heading down an alley way away from others, or going into a suburban apartment block.
Rule 3. Always learn the local tipping customs prior to leaving AU. I've had both the embarrassing experience of tipping when I wasn't meant to, and not tipping when I was suppose to.
Rule 4. Never trust the bar keeper to fill you in on local tipping customs.
Rule 4a. Beware of internet sites about local tipping customs as well, most of those have been written by Americans who didn't actually know the answer, and broke rule 4 to find out.**
Rule 5. Always try the local food
Rule 5a. With very limited exception, McDonald's does not count as local food.
Rule 6. Always try the local beer
Rule 6a. I am exempt from this rule when in Victoria and VB is the local beer.
Rule 7. Trust people, it's amazing the strangers I've met in my travels who have then taken me on a locals tour. Of course, Rule 1 is applied heavily prior to following to this rule.
Rule 8. Have fun, and don't let a little thing like a delayed flight, a missed connection, a problem with a hotel, or other annoyances are a part of traveling. Wear those sort of things like war stories, a great yarn to tell back at the pub when you get back home. "Did I tell you of the time when my plane broke down in AKL"
* - This rule is most certainly applied when the individual who approached me is a taxi driver. I have a general distrust of taxi drivers already (GPS is my friend and I have caught quite a few out for taking the scenic route, inc a CBR taxi driver), so if they are approaching me, something is absolutely not right.
** - Outside of asking on AFF, I usually look at what the website says about the tipping customs of the countries I've been to, if they get it right it's a good bet they've actually done their homework.