I would not and can not take off for my hubby, where my hubby works it HAS to be the employee putting in the request because many have important things to get done that even the boss does not know about. That is something he has to arrange at his work plus he has a handful of meetings through out the week he can not miss. If you want ask him to take that day off and you surprise him with the plans. My hubby would NEVER take a sick day if not sick, to me that is just poor work ethics (if you need a mental health day ok), it would have to be an vacation day to do what you are suggesting.
Yes we do take off at our anniversary. Sometimes we arrange a little getaway where our daughter stays with the grandparents while we get a hotel for the weekend. Otherwise we just do date night, hire a sitter or have daughter sleep over at the grandparents, and we spend some good one on one time together. It is important to keep doing that in your relationship.
I have found that when hubby takes off if we are not getting away to somewhere we just end up doing projects around the house instead of spending time with each other.