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Use lots of command hooks to make a tree on the wall, out of reach of little hands. String tinsel etc in a tree shape then add baubles etc.
When my kids were little I always put the tree in a playpen so they could see but not touch.
Do you have a fire place? Friends have one in the middle of tge room and strung lights from the outstide edge to the top of the flu - makes a cone/mas tree shape. The hang decorations of all the little holes in the meyal flu.. All the presents go around/on the fireplace and the metal fire protection/barrier/fence thing stips kids from getting to any of it! It looks great!