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Once you're done here, pack up and head to the Retired Federal Reserve where the Geocache item is a 1798 English Dueling Pistol found inside the safe door. To get to the Blueprint, you'll need to get the Key from Grant's Home. Use the it on the safety deposit box inside the safe. Get to Grant's Home and get General Custer's Coat Button (left edge of the light fixture) for the Geocache. The money can be found by breaking the mirror as opposed to breaking the flower pot, which will get you the shotgun shell. A key - the Golden one - will be found on the mirror on the left side, whereas the Key that you need can be found by using the key you used previously to open the clock door. You need to hang three weights and click on the Painting in the upper right. Move the weights around to match the picture.
Now its time to get to the New York City Docks, where the Geocache item can be found on the boat railing (its the USS Princeton Steamship Propellor). Get the Pears and the Oil can on the crates before you leave for the Brooklyn Bridge. (To leave, you need to cut the ropes and use the keys on the boat)
Finally, at the Brooklyn Bridge collect all pertinent items as well as John Roebling's Pocket Watch for the Geocache. Dust the bush and the bridge base to collect the tennis ball and the 1804 sign. Now use the crank handle on the winch and lower the scaffolding to find the water on the right. Use the Destiny Scanner on the lower center of the bridge base, use the pickaxe to reveal a door, and open it.