How are you enjoying retirement?

I see a former co-worker or one of the neighbors and wait for the dreaded question."Now that you are retired aren't you enjoying all your free time?" Frankly, no. Sure at first it was lovely to go the the yoga class at 8:30, have a spontaneous lunch date or take the dog for a long walk in the park. I cleaned up the yard, went kayaking and sat outside and read my book. Now the days are beginning to drag and blur together as I look for ways to fill all my free time. I wake on Monday mornings knowing that I have nowhere to go and nothing really to do.
There is all kinds of information about retirement and finances (which is very important) and general information about what to do after retirement (volunteer! take a class! travel!). But I haven't found much written about the emotional ups and downs that come after retirement. Kathy's Retirement Blog addresses some of these feelings. I was glad to know that I wasn't the only one having trouble adjusting to retirement.
The dictionary defines retirement as a, " withdrawal from one's position or occupation or from active working life; the act of going away or retreating." Most of the people I know who are retired or about to retire don't see themselves as withdrawing or retreating from life. They are looking for ways to enjoy themselves and contribute to society.
I think some of the adjustment issues stem from how society views retirement. I read somewhere that everyone wants to retire but no one wants to get old. When you retire you lose one of your major definers as a person--what kind of work you do. Suddenly you are invisible, uninteresting and redundant.You are the annoying person holding up the line at Starbucks because you want to chat, the old lady in the cat sweatshirt or the cute couple who eats dinner at 4:30.

September has always been a time of renewal and beginning for me---a new season, new school supplies, new clothes....Now I begin another adventure, a new chapter in my life.
 How do I adjust to retirement? What is dynamic aging? What are my passions?