Yes, you can use your Michigan registered boat in Florida. However, there are a few things to keep in mind. First, you will need to get a temporary registration from the Florida Fish and Wildlife Conservation Commission (FWC). This can be done by either calling the FWC or visiting their website. Second, you will need to have proof of insurance for your boat. Lastly, make sure to check with the local county or city regulations on where you can dock your boat overnight.