If a marriage was worth celebrating originally, then it ought to be
worth re-celebrating. An anniversary is much like a shared birthday and
ought to be a memorable occasion. Wedding anniversaries, like other
celebrated days, are worth putting some time and effort into making that
day something to be remembered. Hopefully, good marriages get better
with time, so each year should be a celebration of making something that
was good and meaningful into something that is even better.
Do something that would be a pleasant surprise for your spouse. Gifts or
activities are often more fun and meaningful if given as a surprise.
Doing the unexpected usually makes meaningful memories.