Property Tax are deductible (assuming you itemize) for all properties you own - even interest in
DVC. As mentioned by a previous poster, the property taxes are a small part of the maintenance fee.
Mortgage Interest is not always deductible. You can only deduct mortgage interest on your primary residence and one other piece of real estate (and DVC can count as this real estate).
The only other way to deduct other parts of the MF is by treating it a a rental/business. But even in that case, the cost of a trip to Fla would not be deductible - as mentioned previously
Another tax matter that is in the MF are costs for capital improvements. Technically that increases your basis in your DVC interest. So if you sold your DVC at a gain the amounts paid for such capital improvements would decrease the amount of the gain. But this matters only to those who bought DVC many years ago (since they are the only ones who may have a gain if they sold)...
I am a tax practitioner - you'd be surprised what people (even professionals) put on their tax returns. Only if the IRS audits you will you have to deal with the issue, but the benefit is miniscule with trying something like deducting all the MFs vs the embarrassment and cost/hassle of getting caught.