Simply log into the game consecutively 10 days in a row. The game provides incentives for logging in. Additionally if you are a premium member, you get an extra reward. Here are all the rewards for 10 days. Premium items in quotation marks.
Day 1 - 1 Apple Slice "25 Coins"
Day 2 - 10 Coins "1 Apple Slice"
Day 3 - 1 Apple Slice "25 Coins"
Day 4 - 10 Coins "1 Four Leaf Clover"
Day 5 - 25 Coins "1 Big Apple"
Day 6 - 1 Apple Slice "25 Coins"
Day 7 - 10 Coins "1 Apple Slice"
Day 8 - 1 Apple Slice "25 Coins"
Day 9 - 10 Coins "1 Four Leaf Clover"
Day 10 - 1 Apple "1 Sugar Cube"