Just purchased an 84 hilux surf today!

Just wondering what further mods you think would add to the performance of the truck. It will probably eventually end up with a V8 but before that I'm looking at modding the suspension and drivetrain. I've been considering a diff lock, hopefully get a winch at some stage too. Just wondering what you all think?
Also any good places near Auckland to test it out? I'm new to off roading so am up for anything.
Mike