for little BS rides i usually dont check anything. for anything substantial i check coolant, oil, brake fluid, power steering fluid level and see if it seems burnt at all, top off any if needed(dont forget the washer fluid), check the oil seperator, tires odd wear and make sure none have any slow leaks, check shocks for any leakage, check air filter and all connections going to the throttle body, also make sure all recovery gear is in working order, check spare tire air pressure, check brake pads i am sure i am forgetting something
also if i have the time and its been a few months ill give it a good wash and do atleast a sealant if i dont also wax and glaze it. helps to not get any trail pinstripes and really helps with cleaning afterwards