At the start, to the right, where the big blue box is. Smash everything and build some pipes along the box. Then smash the grey boxes behind the blue box and use someone with Fuse Box Access (e.g. Ms. Marvel). The Box opens. Hit the prezzie and put together the Minikit.
Go down the corridor to the beds. Destroy everything that's on the right one. Then use Telekinesis (e.g. Surtur, Doctor Strange) to put the tape into the slot to the right.
At the end of the corridor, where Star-Lord opens the lid down in the story, look left. There is a Minikit behind glass. Destroy everything and use Target (e.g. Captain America, Ironman) to hit the buttons.
Continue with the story to the next section, where you landed in a section of a town. In the front part of this area, there is a pool with sprinklers in it. At the right end of the pool there are some controls but they are frozen. Use a character with Heat (e.g. Ironman / Dormammu) on the ice.
There are two other pools next to the sprinkler pool. In those pools, you'll see a being with an eye come up now and then. Hit or shoot 5 of those.
Next, go down to the pier, where the boat is. There is a gold block next to the crane. Use heat (Ironman / Dormammu) on it. Then, fish 3 times to get the Minikit.
Fly or swim out to the water. There's some raft with a Silver Lego Item. Use Silver Lego Blowup (Ironman / Rocket) to deal with it.
Back on land, basically up from the pier, you see a golden wall. Use heat (Ironman / Dormammu) on it and go inside.
Peril Character (Stan Lee)
From here, go to the right. There is a crashed blue spaceship. Stan's sitting inside. Use Sonar (Black Bolt) to blow up the glass.
From here, just go to the far right. The Minikit is hidden behind the wall / structure.
Continue with the story and advance to the boss fight. At the center front, there is an item to blow up with Silver Lego Blowup (Ironman). The minikit will be shot into the sky. Fly up. Just follow the silver lego stud line to get it.
At the far left, there is a cracked wall on the floor. Use someone with the Smash Walls ability (Dormammu / Hulk).