The Rhyme Scheme

You find a strange note in Sonata Town, that promises a reward if you manage to solve all the riddles.

First riddle:
Greeting finder, greetings friend!
To make you rich, do I intend.
Find my clues, and heed them well,
Seek the riches where they dwell,
And you Shall thank me in the end.

A road twixt pines and cascades tall
Journey's start, but not for all
Wooden bridge, some stairs, but see
Stop halfway and check that tree!

The second riddle goes a little something like this:

Where nuggets gold in tall stalks grow
And rumours tell of things below
In a hole, next to one more
A stone by two has things in store

The third riddle:

Gas lamps found on three of six
Giants slain in place of bricks
Two shine light on written word,
Step right up and check the third!

The fourth:

Where feet sink low and lights raise high
And giants, hollow, dead, stand by
A question asked while neath the screen
Refuse it in the circle green