The good new is that since you'll be touring in flat terrain, the extra weight will have minimal impact on you. That said, I agree with the comments above. Also, I don't see the point of two identical multi tools, or taking any spare cables. For the dérailleur, just a front will give you 3 gears - plenty for the flatland of Florida. Likewise, all you really need is a front brake. The potential issue is only temporary since there are bike shops where you're touring.