To obtain the Beacon of Hope side quest in Dead Island 2, speak with Sebastian in the backroom of Lotusville Re-Aging Clinic in Hollywood Boulevard after beating the game. For this quest, make for the Old Dynasty Chinese Theater.
A Crusher and other zombies await your arrival. Defeat them then speak with Sarah up on the western window.
She’ll need you to head into the metro station to look for the SpaceFox spotlight filter. You’ll find it on the floor in the ticket office. Return to Sarah to find out that fireworks are somehow going off. This of course draws zombies so fend them off while Sarah shuts the shutters. Once you’ve defeat the waves of enemies, put the filter on the spotlight then speak with Sarah.
She’ll congratulate you on a well job done. Return to Sebastian to report back your success. As a reward, you’ll receive 6,000 XP and The One (a sword).