Minecraft fall tips?

The following: I have built my village in front of a large lake, actually that's nice too but always come at night these drowned and kill my villagers. Which trap can I build for them? I had the idea to build at the lake trap doors that are triggered by pressure plates. Then they would fall in lava. Is this a good idea? And what tips can you still give me?

How about magma blocks? (also under water:-)

The idea is good but this lake is very big. I can't lie down these blocks everywhere. I try it first with my idea, if that does not quite help then I try your idea

Otherwise there would be iron golems ^^

I completely forgot that. Can the swim (or dive)

Can you install them?

If not build a fence around the lake and put in the lake servants which you call the ambus "Johnny" (the servants attack not only enemy mobs but all, unfortunately also village dwellers therefore fence)

I know how to build them (if that's what you mean)

The iron golems are completely immersed in water so they can dive indefinitely