1. Tica's (Costa Rican women) can be very aggressive...if they like you, you'll know it =p
Yes - 100% true
2. You don't need to speak the local language to pick up a girl....body language rules!
Yes - 100% true - same as in any country almost
3. You can either live very cheaply or at just below normal US prices.
Depends where you live - in central San Jose or outside smaller cities yes - in Escazu or Santa Ana - no
4. Tico's wield cars like weapons.
Defensive driving
5. Most non-tica's have zero interest in non-tico men...so if you wanna come down here to pick up European and American women, you're outta luck for the most part.
No idea - no experience here
6. You can go out all night, buy your friends multiple rounds of drinks and walk out spending less than $30.
Yes - 100% true
7. It's cheaper to buy a beer, than a Diet Coke.
Yes - 100% true
8. You can take a weekend trip to the Caribbean for under $80.
Not sure - haven't tried this - if you take the bus I can believe it - driving and the cost of gas - probably a hard figure to match.
9. There are NO street addresses. My current address is one block east of the BurgerKing and one block north of the corner store.
Yes - 100% true - I'm 500 meters from Tony Romas and McDonalds 
10. Cable internet is going to cost me almost a third of what I pay for rent.....but rent is around $275 for a 2 bedroom.
Again depends where you live - in Escazu rent is $1K ++ for a fully furnished executive rental with leather couches, plasma TV, etc.