How can you get from Lisbon to Cabo da Roca?

So... I would like to know how to get from Lisbon to Cabo da Roca? Do I have to go with organized tours or by myself? What is the cheapest way to travel? By train or bus? How long does the ride take? Thank you!|||Go to maps.yahoo.com and enter it in. Then look at the route. I would suggest contacting a touring company in the area to see what you can do.