Side mission 1
The chapter below of our Assassin's Creed III Remastered guide contains a map of Northern Boston, along with the locations of side quests and recruit missions.
Free the civilian held in stocks.
Side mission 2
Catch and kill the bandit who's forcing tribute.
After a conversation in the tavern, you will receive a mission of killing the local Templar officer.
Head to the designated spot, press the Assassins Guild button and choose "Bodyguard".
Doing so you will call in your associates who will attack and guard who notices you. Head together to the end of the pier and kill the officer to end the mission.