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If you are not getting any misfires (the mechanics PST2 or PIWIS, or your Durametric tool will show this), and it is not driven in the cold and wet, I think I might just leave well enough alone. Change the serpentine belt if any cracking or advanced age, check the water pump and various pulleys for play while swappung the belt, visually inspect the hoses & replace if indicated, maybe put in fresh coolant and brake fluid depending on when/if this was done before, change the oil and filters, lube the top mechanism, and go drive it. These are the kind of things more likely to leave you stranded or in a predicament, or slowly damage your engine over time.
But if money is less of a concern and your goal is to be comprehensive about anything that could reasonably fail and cause you to need a service appt during the driving season, then sure go ahead and replace plugs & tubes (mechanic can incidentally note other aspects of engine health by doing so) and since there should be no extra labor charge for coils if you are already doing plugs & tubes, maybe prophylactically put in new coils too. And yes, if several coils are already cracked, they are probably not long for this world so might as as well go ahead and swap all the coils and plugs at once and get it over with, but there really is no urgency until you are getting misfires (so you can defer this expense for a little while even if cracks are present)
The cost to stay fun, reasonably reliable, and safe is not that high, considering what you are driving. But reliabilty approaching that of a new car comes at a very high price approaching that of the new car, especially if someone else does all the work. I think my 1st paragraph is the happy medium, but to each his own.
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