Roger,
That's an interesting site. I note that not all the businesses are shown, only the ones that subscribe.
We moved our boat from Everett to La Conner recently and I have found that almost all of the businesses in town are within walking distance of the marina.
There is a current in the channel almost all the time. Slack occurs about midway between high and low water. The current runs north during flood tide (going from low to high). Before docking, determine which way the current is running and how strong it is. Look at the pilings for clues. It is best to dock with the bow going into the current.
Please watch your wake in town! If going into the current, your wake will be higher that you might think.
North of the Twin Bridges (Hwy 20), the red and green bouys change sides, so check your charts carefully to stay in the channel.