I think you are wise to tell the lady friends who are showing interest in you that you are still married and, if and when, you are divorced, you will then think about dating...but until then, you need to focus on you and your family.
As for inviting your wife on trips, you may want to tell your eldest children that this is a "bonding" trip for just you and the kids. Your children do not understand what is going on and most likely are wondering why "mom" isn't invited, but you are wise not to go into detail w/them about the situation.
If you aren't sure what to do about something, then do nothing for the time being. Sit quietly and the answers will come when you least expect them to.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
