1500 XP, Piranha Mod
After completing The Second Head of Cerberus, talk to Garrett to start this quest.
Follow the mini-map until you see a ladder, the first one is just at the top.
For the second one, follow the map to a set of stairs, go through the archway, and the ladder you need will be ahead to the right. There will be punks with guns defending this one.
For the third one, follow the map through an alley way. The ladder you need is at the end of the alley to the right.
Head back to Garrett to collect your reward. Also don't forget to collect your cash from Hugo back at the church if you did all these quests in a row.
Tape - One the ground next to the third speaker.