The Gen 1 head gasket was originally a single layer that did not always seal. Some will say it is not a matter of if, but when. Others will point out that cylinder liners move and cause the leak. I had a lifter failure at 80,000 miles and to change them had the heads off and my head gaskets were good, not leaking. Perhaps use, antifreeze selection, and regular maintenance helps. The replacement gaskets are improvements and there are now inexpensive aftermarket versions. Before you plunge into doing it "anyway" you might want to look into the price of other gaskets, as some are not cheap. Labor and effort is typical of this job.
Other mandatory fixes?
See that you have newer tires and if not an ABS car, practice quick stops to get used to the only-front-brakes feeling. You'll lock up the fronts easily and then you'll have to decide if you want to balance the brakes with a nice four wheel four piston big brake kit or a more cost effective rear caliper swap.
Many others will have their own definition of mandatory...