Depending on where you are real estate is usally a safe bet.
When I first went to school (17, WLU in Waterloo, ON) I bought a townhouse and rented 2 of the bedrooms to pay off the bank. However, I didn't realize that between the two universities and one college they were going to open up 20,000 more seats for full-time students...
By the time I sold property values had skyrocketed to about 200% in 5 years. A moderately nice 3BR townhouse that was bought for 76K ended up at around 145k at selling. I was lucky to graduate after 7 years of university with no loans, debt or anything really...
However, I'm back in Northwestern Ontario, where there's a mill shutting down everyday. Not exactly a good market if you expect to ever resell. A nice sized home in some communities that were purchased for 85-100k ten to twenty years ago can go for 10-20K if people are lucky. One home in a community I work in went for $6,000; and we're talking a nice 3-4 bedroom, 2 story home.