Travel.  If you have the opportunity to do it, just travel.  I think it was a cousin living in Montego Bay who said that to me and there have been times when I have taken his advice and there have been times when I have not

 

I lived in East Africa for a while and it gave me the unfortunate belief that 'it's probably OK to walk down this lane in Delhi' or 'we'll be fine up here in the Atlas mountanins'.  So far, it has usually turned out right in the end; usually

 

And always have your next trip planned or in a planning phase; Last two trips? Tokyo and Istanbul. My next trip? Ireland :-)