During an Adventure Club Quest your Adventure Club can earn three Milestone Club Rewards. Every Milestone Club Reward is granted after a certain amount of Adventure Club points was collected by you and your Adventure Club members. All Adventure Club Members recieve the Milestone Club Reward, once a certain milestone is achieved by the Adventure Club.
The first Milestone Club Reward is a 5 Minutes Unlimited Energy Token.
The second Milestone Club Reward is a 10 Minutes Unlimited Energy Token.
The third Milestone Club Reward is a 15 Minutes Unlimited Energy Token.
Once you win a token, it can be found in your token storage and used whenever you want. From your island screen, click on the brown chest then the Token tab.