To find future tide elevations in the Skagit Bay area, go to this url:
Scroll down to "Saratoga Passage and Skagit Bay".
Check the bubble next to "Coupeville, Penn Cove, Whidbey Island".
Pick the month, day and number of days you want displayed.
Important: There are two low tides a day. You want to go on a day when the daytime low tide is less than 1 or 2 ft above MLLW on the tide table.