Piper ribesioides
[Pepper Wood]

photo
DSC01228 (12)
photo
DSC01234 (12)
photo
DSC01229 (12)
photo
DSC07732 (12)
photo
DSC06176 (12)
photo
DSC07734 (12)
photo
DSC08544 (14)
photo
DSC08538 (14)
photo
DSC06180 (12)
photo
DSC01240 (12)
photo
DSC03186 (13)

This climber may be Piper pedicellosum, another similar-looking Piper species.

Close-up view of the young fruits:

photo
DSC06185 (12)
photo
DSC06176 (12)

The pictures below were taken from another location but I suspect it might be the same plant as above.

photo
DSC05691 (09)
photo
DSC05684 (09)
photo
DSC05690 (09)
photo
DSC05686 (09)
photo
DSC05688 (09)
photo
DSC04795 (09)
photo
DSC04796 (09)