Buy a single family dwelling and become a landlord. Great way to make money, but believe me, it is not a career for everyone. (I couldn't do it)
Buy a fixer upper. Fix it. Flip it. (it helps to be "handy")
Buy shares of a Real Estate Investment Trust.
A great answer, you can also go for buying condominiums . They are a great source of investments now especially in Canada. Most of them prefer to go for condominiums. Investment made in such sector is worthy.
Here are some general rules and regulations.
How can I venture into property business?