Goal setting is a great idea, but you do need to allow for flexibility because even the mightiest river can change direction. Adaptability will either be a friend or foe in long range planning. Most cities have a 1 & 6 year street plan - the first plan is for immediate needs and the second is almost a wish list of things they'd liek to accomplish, but at the end of the fiscal year both will be readjusted based entirely on what the year actually held.

I wish you much success.