The Activities Stamps can be collected at any time. Some are very simple that you can perform on your own, others you will need other people to join you at your stamp collecting quest! If you have any additional questions, please feel free to ask in a comment!
Here are the types of stamps:
Operate the Switchbox3000 at the Stage. (Push all the buttons)
Go to the Underground Pool from the Plaza
Use Camera Item on top of the Mountain
Use Rubber Duck Item at the Cove
Throw 10 Snowballs at the Target at the Snow Forts
Collect 1 EPF Medal (From Field Ops)
Log in once you are 183 days old
Waddle around 30 rooms
Get 10 people to dance at the Night Club
Get 10 people in your igloo
Use the Coffee Apron to serve Coffee and press E+C (5 times)
Use the Pizza Apron and Chef’s hat to serve pizza and press E+Z (5 times)
Collect 5 EPF Medals (From Field Ops)
Collect 10 EPF Medals (From Field Ops)
Log in as 365 days old!
Have 18 puffles in your igloo at once!
Get 25 people in the Night Club Dancing!
Put 99 items in your igloo
Play it Loud!:
Have a Guitar, Base, Drum, Trumpet, Tuba play at the Lighthouse Stage
Drill with 30 penguins on the Ice Berg
Throw Snow with 5 penguins the same color
Have 5 people wearing Hockey jerseys at the Stadium
Collect 25 EPF Medals (From Field Ops)
Have 5 people wearing Soccer Jerseys at the Stadium
Get 30 people to party in your igloo
Get 10 people wearing only Ninja Items at the Ninja Hideout
Collect 50 EPF Medals (From Field Ops)