Free Alarm clock
When Summer day eight arrives, just walk over to grants house when he's home. When you talk to him, he'll hand you a alarm clock. You don't even have to be his freind.
Hint: Golden Wool
To acquire some Golden Wool (which sells for 500g apiece), brush each side of any given sheep three times. The wool will then fall to the ground. (unverified)
Unlockable: Town Spirit record
You have to become Sebastian's friend and enter his room.