You NEED to have facebook for this, if you have enough neighbours, fill up your house with swings (They add 750 simoleons)and watch as your town value increases. just store them all in your inventory then add more and more!! eventually you will reach the required amount to get an award. This is usually 5LP's
keep doing this and you will not only [b][/b] get more lp's but become top of the leaderboad on the party boat :-) Hope this helps!
Note: This is almost a non-stop cheat, it has worked ever since i got it (about a year ago)