I have mostly spawn proofed an island base inbetween two rivers (meadow biome) with a few workbenches and then surrounding it with walls (in the water so not spoiling the view).

Does make the non-flying raids more boring though xD (although had to put roof on the boar pen to stop the drakes deleting them).
Have tamed wolves but left them in the pen as un-needed.

Meanwhile skeletons and greydwarves fight each other outside instead of attacking the walls so occasionally go out and pick up the drops



On the other hand, my non-island base in the black forest is usually fine, as with a balcony on a cliff it makes a great chokepoint for raids or trolls wandering by (as mobs try to path under it)