Would this sentence be a correct use of a colon?

The three things I like to do on vacation are: swim in the ocean, shop at the mall, and play at the amusement park.

My English book says never a colon after a verb, but I was at a reading conference just last week and the presenter teaches a colon in the above example. Is this right or not?
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Comments  (Page 2) 
I have always learned and taught that a colon should never be used after a verb or preposition.