You must have most of the stars done, then you will unlock the boat, witch will take you to the island.
1000 miles to get to the island
If you are talking about My Sims agents DS then she is in the east village and here house is opposite the Tailor's.
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You talk to Chaz McFreely on the Beach and then kite surf to the island. Hint: When you kite surf it's easier if you stay to the side.
In the thief's hideout
Give them to her.
I find My Sims Agents wii is better, but it doesn't take very long to beat.
A marshmallow and a apple
You go to the office and kick the table.
Possible flooding
50
Behind the wooden boxes:)