My favorite tip when shooting landscape is to consider the weather.
ex:

It would be fun to shoot downtown along the river. Or on the Barton Creek Greenbelt.
Tips:Look carefully for reflections in the water.
        Lie down and look straight up through the branches; climb a tree to look down the path.
Ex:

 

My 3 fav's from website:

 by: Marco Carmassi

 by: Brad Mitchell

by: deep21

Macro Lens Composition

Rule of Thirds

Leading Lines

Vertical Lines

S-curves

Balance

Light as the Subject

Contrast of Content

Circular Composition

Rhythm

                                                                          N/A
 Frame in a Frame