If I need guns to shoot gators and Florida passes a law that bans guns, what do I do?

you don't need a gun.  Nobody does.

Wrestle them bare- handed, like a real man.

Florida is unlikely to pass gun control laws. The governor and the legislature are controlled by cons.  Besides you do not need to shoot them. They are only dangerous if you carelessly walk near the water and you are surprised by one. Stay away from the water and you will be safe. Alligators are unlikely to attack when they are on land. If you see one walking on the street like that, just stay away and enjoy the view. 

'Rassle them into submission. But not until you put me into your will. 😉

Purchase a sword master the blade and crush your foes

Whack gators with congressmen?

You don't need gunS to do that.  One is enough.  Unless of course you're "rootin', tootin' Yosemite Sam".

Attach a cannon to your porch to keep the Gators at bay

Bow and arrows. Duh. 

You can't shoot gators in Florida even if they are eating you.

That said, I don't think Florida is a "gun ban" kind of State..and such a ban would be overturned by the SC.