Hi Jim:
Look at this thread:
http://www.fishyforum.com/t5035/
Umang Island is a resort, you can find their website here:
Welcome to Umang Resort Hotel :::
BTW, this sunday we will have a gathering in Ayer Island (just 20 minutes by boat from Jakarta), we already have 84 members confimed to join. You're welcome to join us if you want. Cost is only Rp201.400 per person, including boat transportation and lunch. All you have to do is bring your gear to Marina Ancol. This is the fishing result there
http://www.fishyforum.com/t5071/