M.D.
I go away with my kids a lot because I also get 5 weeks of vacation time each year. My husband gets 2. So if he needs to save his time for when we need him to come, that's what he does. I also don't mind traveling with my kids alone and sometimes really enjoy it. That's normally to see my family or spend time with them though. Most of my family lives 5 minutes away, so it's not like my husband doesn't see them too.
I think it's okay to do things alone and together. I want to start a girls retreat and a boys retreat for a weekend every year too. My husband and the boys can go golfing and my daughter and I can go to a spa. I think it'd be great!