I'm not sure if a surprise visit is the way to go -- that kind of still makes it about you and not the relationship, you know? Because instead of it being a built in, permanent change, it's a surprise. It's not taking into account her needs or schedule, or your kids'.
I think 5 days is a good length, though.
Me: 30 H: 29 M: 2 yrs T: 5 years BD: 12/14/12 Divorce talk begins 1/6/13 I filed: 5/20/13 -- no contact since