Two trees on Mokule'ia Beach received significant airtime on LOST -- one (which I'll call the crooked tree) has since died but the other remains (as of August 2011), though unfortunately it doesn't look very healthy either.
It is amazing how the same location is re-used to represent different parts of The Island.
The two trees can often be seen in the distance during scenes set on the crash beach.
The shots of Desmond and Charlie heading out toward the Looking Glass seem to be shot by the crooked tree...
...but the shots of Mikhail shooting at Desmond, which are intended to be at the same fictional location(note the cable in the sand beside Mikhail), were shot near a different tree.