Toad you're on a tight one,
Day 1 is good
Day 2, as said skip Canouan and go to Salt Whistle
Day 3 and maybe day 4 head for the Tobago Cays
Day 4 or maybe day 5. Hmmmm, If you didn't spend the extra day in the Cays you might want to slide around the south side of Union and spend the night in Chathem. Kind of a neat place. Good things going on on shore.
From there a quick trip back to Clifton and either spend the nite at Happy Island or make the run for Hillsburo and clear into Granada. Boy that's a quick trip, I'm wondering when you will have time to enjoy yourself.