It's so bizarre. I have one of each, now adults and they are just their own people. Equally loving, fun, crazy, grumpy, adored and hard work.
They grow up to be individuals. There are some things I do with my daughter because she enjoys doing them, and there are some things I do with my son because he likes doing them. I just do whatever they enjoy because for me it's about spending time with my child, not a woman or a man.
Fwiw I do go to a spa occasionally with my daughter because she suggests it. But if she never suggested it I'd quite happily not do that with her and do something else. If instead she was really into football I'd do that with her instead.
Likewise I go for a meal with my son because that's what he likes doing.
I can go to spas and restaurants on my own, with my partner or with friends - I don't NEED a child to specifically do those things with. I just need my children - their gender is irrelevant.
Enjoy your boys - they will be a total joy.
My MIL had two boys and she was without doubt grandma number 1 with one set of grandchildren and was totally adored by mine (and me) even though we lived a bit further away.
We lived about 2.30 hrs away but made the effort to see them every month because they were so lovely. Best in-laws ever