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Submitted by i beat the game!
Entry location: Haven City
You need a jet board to get the most out of this hint. Go to Haven city and there are three towers on both sides of the water. Keep going around either middle tower until you see a pipe stuck on the tower
Now jump on it and at the top of the pipe the wall will slope, but a bit further up is a small ledge where you can stand up. Jump on to it and keep looking for another pipe like the first and jump on it. Sometimes a pipe may be too high even for a double jump so use a big jump, starting from a crouch.
Keep jumping up pipes like this, until the last one there will be a sloping wall above you. Jump on that and you will be on the second level of the tower! Now repeat and look for pipes again to jump higher until you are on the third and final floor of the tower.
Now wander round and enjoy the view! But if you are here for the orbs, listen to me! Go around and destroy the boxes around the floor. You will mainly get health and gems, but you will also get 4 orbs. Now grab your jetboard. There are some electricity lines, get on and grind on these and you will get lots of orbs. You will grind to other towers where you can find even more good stuff!
Submitted by Omin's cheating friend
Collect all 600 Precursor Orbs and the colour of Jak's scarf will change to green. (Hardly seems worth it.)
Submitted by Some_random_dude