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I haven't been to Indonesia.

Other People's trip reports
Indonesia (esp. Sulawesi) 2009: Steve Anyon-Smith, 1 month & 20 mammals including Sulawesi Tarsier and Bear Cuscus.

Greater Sundas (West Malaysia, Borneo, Sumatra, Java) 2008: Tim Mitzen, 2 months and 55 mammals including a Sun Bear. A full trip report is here.

Indonesia (Java and Sumatra) 2001: Susan Myers, 2 weeks and 7 mammals.