If you mean Sims 2 for the DS, you have to build the basement/hidden bunker (whichever you call it)..he lives there. You should have some food on you though to give him, he will like you then. Eventually he will become you're friend if you give him some food everyday.
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You need the sims 2 bon voyage first of all. Then you dig for treasure outside until you find a map. Next you have your sims go on a vacation to the three lakes. Then they will be able to go to the place where the map says to go and there they will find bigfoot!
why not...
Your computer may not meet the sims 2 game requirements.
To meet a monkey in sims 2 castaway all you have to do is go to the jungle, usually monkeys will come to you , and then you can befriends , chat ,hug ect with them :)
built the secret warehouse. it will appear after 8 hours next 2 the government lab under the barrels!! hope i helped