Bringing everything back from the island

THE UMBABWE ISLAND has several useful things, and its garden shed has more. But Seymour can only carry three things, and two of them are needed to fly back.
Nudge 1Where to look
You have one free hand per trip. You'll be flying more than once.
Nudge 2A stronger push
Leave things on the mainland between trips: anywhere in MGAMBA VILLAGE is fine. Spread them out, so picking one up doesn't grab another.
Nudge 3Almost there
Three things here matter now: the key in THE GARDEN SHED (press action at the shed's door), a bunch of flowers and a pair of rubber gloves. A fourth, very green, matters much later.
What you needOther problems to solve first
Solve these first (each opens its own page, no answers on the way):
Show the solutionThe whole answer, with a video
Make a trip for each: the studio key from THE GARDEN SHED (it opens Rick Bracy's door in the maze), the bunch of flowers (for Pippa: The big red door is locked) and the rubber gloves (for evidence: I got arrested!). Each time, fly back, put everything down in MGAMBA VILLAGE, and pick up just the pump and the balloon for the next trip. Later in the game you'll come back for a green arm (The machine in the operating theatre).