Can you get past the snake?

Hint 1 of 5:

Although this is the first puzzle you see, you must solve it last.

Hint 2 of 5:

Wait until you've finished with the desert and forest for this one.

Hint 3 of 5:

Has the gypsy wagon left yet?  If not, you have to wait.

Hint 4 of 5:

Rattle snakes scare with (and by) rattling sounds.

Hint 5 of 5:

You can find a tambourine where the gypsy wagon was.