Cut the truck of the palm tree into two equal sections using a saw. While these sections don't have to the same diameter, they must be the same height when they are sitting beside each other on a flat surface. Ideally they should stand 2 to 2 and 1/2 feet off the ground.
Shave the skin off the outside of the saw or a small hatchet. Remove all of the palm tree bark from the outside of each section and be sure not effect the equal height of these two sections.
Sand down each of these two sections of palm tree trunk with medium grit sandpaper at first and then fine grit sandpaper at the end. Smooth out the rough edges along the sides and the corners. Take each sanded section outside and stain it whatever color you would like.
Have a large 1-inch thick piece of glass cut and smoothed along the sides. You can do this yourself with a heavy duty glass cutting machine, large pieces of glass and a shop to do this in, or you can have it custom ordered and delivered.
Place each try stained, sanded section of coffee table trunk down in he place where you want to set up your new coffee table. Place your large piece of glass on top of these palm tree trunks and arrange it how you like.