Below is a complete list for the locations of all minikits in Chapter 04:Shakespeare in the Park.
Part A MInikits
Minikit #01: Activate the S.H.I.E.L.D. control panel next to the runway lights switch.
Minikit #02: You can spot this minikit floating next to the control tower, just below where Stan Lee used to be.
Part B MInikits
Minikit #03: At the beginning of the second area (Loki encounter), destroy the lock on the bike and get on. Follow the trail of ghost studs to this minikit.
Minikit #04: Look at the building off to the left side of the area to spot a pink planter that you can destroy and create a vent from. Send Vision through it for this collectible.
Minikit #05: There's a building at the rear section of the area that has a clock that telekinesis can manipulate. Fly up there to make the timepiece cough up this minikit.
Minikit #06: Search the eastern section of the area for a car that Ultron can tear apart.
Part C MInikits
Minikit #07: During the third of this level (Thor battle), you'll need to eliminate five spider webs to get this collectible. There's one at the start of this section; another becomes visible behind Thor once he takes position on a rock; a third is on the path to the left when you make your way back to the beginning; and a couple more are on both sides of the path to where Thor is after your second encounter.
Minikit #08: For this piece, you need Hulk to smash through the fissures on the boulder that Thor uses as his perch.
Minikit #09: You must use telekinesis to move the plant next to the cracked boulder that hid the 8th minkit.
Minikit #10: Head left from the area where Thor's Rock is and look at the lower portion of the path for a dig spot. Take the tractor you found to the right and finish the race for this piece.