I Ace and collect all of the single-player Goodies in the "Swinging Safari" level.
Acing this level isn't too difficult, but beware of the jumping monkeys/primates. Timing is very important there, and it is very easy to get burned if you don't get the timing down.
Compared to earlier levels, collecting all of the Goodies here is a bit more difficult and requires more thought. A lot of the hidden Goodies in the last two main levels of "The Gardens" area simply required you to return when you had the appropriate Sticker, but you'll have to do a fair amount of platforming and exploration here (and in other portions of "The Savannah") if you want to acquire everything.
Also, I'll typically include the Cooperative Challenge(s) and its/their exclusive Goodies in a Part shortly after my recording of the first time through the level. For many levels here on out, I tend to combine remaining single-player Goodies, the Cooperative Challenge area and displaying the Collected All Gifts into a single video/Part.
Revisit: Cooperative Challenge Area
This short video covers the Cooperative Challenge (and its exclusive Goodies) in the "Swinging Safari" level. Just slightly more complicated than the first one, but still very easy.
Special thanks goes to the two random online players featured in this video. The player wearing the Shark costume goes by the PSN ID of Daniel713NS. The player wearing the Old Snake costume had his named simply displayed as Luis, but I believe his actual PSN ID is Luis713NS.
The Voodoo Face Sticker picked up in this Challenge area is useful in "The Meerkat Kingdom".