Mostly just told her I was taking them golfing, or to the driving range/putting green, or to a baseball game or whatever. Every once in awhile -- for the sake of the boys -- I'd tell her she was welcome to come along if she wanted to (she usually declined).
I made sure I did things with them that were authentic (my sons and I have always shared common sports interests), and not for example spending a bunch of family money on fancy lunches or the circus or something that never would have appealed to me and the boys, and then posting pics on Facebook or something).
