Did the 'red' bike tour on a sunny Saturday morning in August. Man, it was hot!
Had a great time, around 4 hours stopping at various points up the east side and down the west side of the river. Our guide, Oh, was super friendly and knowledgeable. She took a lot of time to make sure everyone in the group was ok for water etc. A few stops included delicious snacks.
I've failed to enjoy a bike tour anywhere in the world and this is no exception. Total distance is about 14km, completely flat, and mostly off the main roads. Some parts are narrow and winding but no worries if you are used to handling a bike and/or take it slow.
Very easy to recommend this as a great way to spend some time with a really good tour company.