Dude, honestly? Check over your underside for rust. Other than that, if theres no rust, build the S H I T out of I T.
No 4Runner left behind

But all I can say is, if what you think your going to invest into a vehicle is worth more than the vehicle itself, its not typically a bad thing, just dont expect much when selling. But if your going to keep it for a long time, why not make it your baby right?! Have fun and like Puppetz said, do all maintenance and then preventative maintenance and then go crazy.