We were on Captiva last Memorial Day Weekend ('08). We didn't eat at the Bubbleroom but did stop in for an after dinner drink. While at the bar, we saw several dessert portions being served. I can't attest to the quality, but the size of the portions was huge, easily shared by at least two people.
The rest of the weekend's food was hit or miss, as I reported at... http://www.roadfood.com/Forums/tm.aspx?m=396843&high=Captiva