M.C.
Be gentle to yourself, woman!!!! It took 9 months, plus 2 months of recovery time to get your body "out of shape" so you will need to give your body 11 months to get back into shape!!! (BTW - you will probably NEVER see exactly the same body again, but you can still be fit, tones and sexy). Keep in mind that you are breastfeeding too, which is great. I had the situation where my body hoarded all available fat to use for breastfeeding and when I stopped BF, the fat just melted off - really, I didn't need to hugely change my lifestyle or anything. After I weaned, I lost 1-2 pounds a month and kept it off. Most women lose weight while breastfeeding but I was the opposite.
Enjoy the island, and don't stress too much about the weight, just be healthy and active.