The first week of 2007, go buy seven decks of cards. (via Eric Maisel, and this post on Worthwhile):

Get seven decks of cards with similar backs. Lay out all seven decks on your living room rug, backs showing. This is a year of days (give or take). Let the magnitude of a year sink in. Experience this wonderful availability of time. (This is a powerful exercise.)

Carefully count the number of days between two widely-separated holidays, for instance New Year's Day and the Fourth of July. Envision starting a large project on that first holiday (today!) and completing it by the second.