As far as I know there is one optional tour. It is to three personal gardens. Here is a link to the gardens. At the bottom of the page, click on the link for "optional excursions".
Have a good day and see you in Ontario.
From: Char Holte <email@example.com>
To: firstname.lastname@example.org; email@example.com
Sent: Thursday, January 5, 2012 1:44 PM
Subject: [iris-photos] RE: OT Convention
Does anyone know what the two extra tours are. They list the price on the registration but do not give details.