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Part #21 - Banham Canyon
This lone house sits in the east of Banham Canyon. Head to the backyard to find a space ship part by the pool.
Part #22 - Richman Glen
This is at the rehab center in Richman Glen. Head inside and look for the large tree by a zen pool. The part is at its base.
Part #23 - Vinewood Hills
This one's on the roof of the Galileo Observatory in Vinewood Hills. Take the stairs up and grab your prize.
Part #24 - Vinewood Hills
This tricky part is atop an observation tower in the eastern lake of Vinewood Hills. You'll need to take a helicopter or parachute down to reach it.
Part #25 - Vinewood Hills
Note this column just south of the previous part. Dive down on its left side to find another.
Part #26 - Rockford Hills
This one's easy to find. It's on an island in the golf course.
Part #27 - Burton
You'll need a helicopter for this one. Fly to the marked rooftop on the map to find an empty pool. Well, it's technically not empty - there's a space ship part inside.
Part #28 - Burton
This one's easy to spot. The upper level of Rockford Plaze has a small grass island; this space ship part is in its center.
Part #29 - Richards Majestic
You'll have barge in on the movie set for this one. Head to the southernmost building (with the orange roof) to find a space ship part on its balcony.
Part #30 - Vespucci Canals
Head to the Liquor Hole in Vespucci Canals. See that lovely sign jutting from the roof of the store? Use the ladder behind the building to get up there and discover a well hidden space ship part.