I have been planning ours today...though it includes some museums.
Swimming at the local YMCA ( we are members, but it only costs a few bucks if you are not...some have rock climbing walls too )
Some stuff at the small local library - sketching animals
One small museum by our home is doing a Presidents' day party with cake, then a movie.
The small local zoo is offering a hike in the woods looking for winter animal tracks - Are you close to the Stone Zoo or have one closer that might offer something ? Or you could do this on your own..buy an animal tracking guide or borrow one from the library. Or even taking binoculars and driving somewhere to look for birds or animals.
Any community theaters where you live ?
I am sure that there are small places around where you live that will be offering stuff like that. Or do your own Presidents' day celebration.
It is also Black History month, so maybe something to do with that.
Our museum keeps a list of fun things for vacations, you could check yours out.