Agree w/ skipping Canouan.

Day #1 - might push on to Mustique and eat the $85 mooring fee just to get closer to the Grenadines. In the grand scheme of things you'll never remember the $85.

Day #6 - suggest PSV w/ Dingy trip to Mopion. The snorkeling West of Mopian is wonderful - like flying through the grand canyon on a tiny scale.

(BTW, we tried to anchor the yacht near Mopion but clearly didn't get the secret-handshake right. It's a lot of rock & coral, not much sand, and very shallow.)