Sonic Adventure DX Director's Cut Tips

Tails in Emerald Coast
Go to the Hotel with Tails, exit into the pool area. Then turn right until you're under the little ledge. Start flying. After a little while, you go through the ledge. Fly behind the building and over to the Emerald Coast area.

Note: If Tails runs out of strength before you get there, you'll die. Land on the strip of land, and the screen will darken. Once it loads, you'll be on Emerald Coast with Tails! You can only go as far as the cave by the light house.
Enter the cave and you will see blue and a spring. After a few seconds the screen will darken again and you will appear right in front of the gate in front of Emerald Coast.