To get into neighbourhood mode all you have to do is click on the symbol with the three dots and it should come up with some more symbols. then click on the one with four houses on and then it will say "do you want to save the game". choose yes or no and then it will load the neighbourhood and you will be in neighbourhood mode.
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In neighborhood mode, type intProp maxNumOfVisitingSims [number] into cheat console.
it's allready there... click on my documents, ea games, The Sims 2, neighborhood, (number like plesentview would be one... if it has an E in front of it it means expansion sign) then click on story telling and your pictures will be there somewhere
If you mean Sims 2 Castaway for PS2 then no, there is unfortunately no two player mode that I know of. Sorry!
Type in the boolprop cheat in the neighborhood. Then go into create-a-sim and press shift+N and that should do it.
You can only change the weather if you have 'the sims 2 seasons'. You change the season in the neighborhood in the corner to the left (up).