Great to read your update, T. It sounds like great progress overall. When you've put a lot into a relationship, of course, you'll continue to reflect on it for a while. What went wrong? What went right? How to have better relationships in the future? As DnJ suggests, take the first year in stride. You continue to be careful about dating and as long as that is the case a bit of companionship and fun can be helpful.
Glad to hear co-parenting is going well too. Having to see a former spouse like that can be challenging I expect. As you've shown before, your focus is doing the best you can for your son as his year of "firsts" will be difficult too.
The trip sounds like a nice diversion. I hope it works out!