You can always live on a house boat or boondocks an RV
I know someone who does that on Winnipesaukee. His boat (which is very nice) cost less than a camp in the area, is closer to the water, and his docking fee is less than he would pay in property taxes on a camp.
Joe
I figured there was someone doing it. He's not paying property tax. The money he pays for the docking fee may indeed be used to pay property tax but he isn't paying it the owner of the docking fee pays it. I could buy something from one of these agorist vendors and if they live on land and use the money to pay their property tax bill, am I paying property tax? One can avoid paying property tax on water or with the RV but I would agree that no one who participates in the wider economy in any way whatsoever, can avoid the added cost of living that property tax creates.
Even if you live on the sea with a house boat and you buy vegetables from some Voluntaryist, you are affected by the property tax, assuming the Voluntaryist pays it for the land to grow the vegetables.
Unless you jump from one house or piece of land to another every two years as the state confiscates your property for non payment. But you couldn't get a loan to buy the next piece because of your history of 'default'. And if you used cash to buy the properties it would cost a hell of a lot more than if you were to comply with the property tax.
The other way is if you claim a piece of state or federal land and try to live as discreetly as possible. Or if thousands of people claim the land and stand up to the state!

Or a downtown business district all stand together in non payment.
Otherwise I do think you can avoid direct payment with the house boat or RV. You can get water from rivers using a filter and small pump and you can discharge grey and black water onto select pieces of state land as you move along and rely on natural attenuation. Obviously the guys that live on the sea have another strategy.
Did you guys see that Stossel show about the guy who is raising money to build a city on the sea?