I have a little piece of advice for being safe from Lava/Fire and Fall damage/death. For this u need to have a faction and everything depends on the faction home.
Here's what u do:Nothing much.Just have Water set at ur f home
What happens here is if u fall on Lava/Fire quickly do /f ho. U will teleport to ur F home and land on Water. UR SAFE! Same goes for case of Falling.
Bt dont try this unless u can type '/f ho' within a second
Hope It helps