Nothing makes SL12B more fun than the SL12Big Hunt. Organized by Rosamoo Mendelsohn and Xia Nishi, the hunt includes over 90 exhibitors in SL12B and spans all the sims with gifts to be found in niches and corners. If you see a parcel displaying the SL12Big Hunt logo, you are sure to find a gift marked by this:
For reference, the hunt organizers have made a map indicating approximately where gifts can be found (current as of today). There is no start point. Just jump in and have fun!