Have a bridge nearby? I know someone who used to back his Cal 29 up to a rail-road bridge that crossed a nearby creek after removing the backstay and running the topping lift to a spinnaker turning block. He then used a come-along on the bridge to lift the mast slightly and then set it back down on the pulpit/pushpit.
But he was a madman. I'm pretty sure the rail company would frown on the practice if they caught him.
Same guy decided the best way to deal with a rotting duck carcass in the marina was to douse it with gasoline and toss a match on it. He's no longer in our marina.
Best system I've seen involves two similar sized boats, rafted up on either side of you, and using their halyards and winches to lower the mast. That needs a hinged mast step, however, or a whole lot of careful thought and prior lashings at the mast base; 'cause if that sucher kicks out it will kill whoever's in front of it.
Charlie P. Mud Hen 17 #69 Mad Hatter
To travel hopefully is a better thing than to arrive - R.L. Stevenson
I suspect that, if you should go to the end of the world, you would find somebody there going farther . . . - H.D. Thoreau