We have all of the kids on the same weekend schedule as well. We will switch the schedules up from time to time so we might have a weekend with just his kids or just mine. My kids live with us most of the time, his are EOWE, my SO is closer with my kids than his own. I think that someone once posted that there are three families in the house. Each family system in the home has a different dynamic, I approach each "family" based on that dynamic. I wont force things that the family is not interested in doing. If his kids are less likely to enjoy doing more outgoing or adventurous, do what you as a family would like to do. If your kids like certain things, do those things with them. I would have conversations with the kids to make sure they want or don't want to do something as a family outing. If you aren't doing activities because his children are thankless and troublesome, it might be a good teaching tool for them to hear that their behavior and attitude impacts your ability to do certain things with them.

We have my 4 on an everyday basis and his two every other weekend.. Its hell! My daughter's behavior is horrible because she is jealous that his kids get to see their father that often and she only sees her dad every friday night into saturday. My other kids hate it when his kids are here because they are 20, 16 and 14 and his boys are 6 and 3. Two little pains in the asses.. Who go into their rooms early early in the mornings and wake them up.. Because for some ungodly reason they NEED to wake up at 5:30 am! My fiance is upset that my kids feel the way they do,but i dont blame them..They are so needy and very emotionally immature for their age.. probably resulting in the fact that they both still share a bedroom with their mother.. But thats a whole nother story.. We are NOT one family.. but two completely seperate families living under the same roof when they are here. It changes the dynamics of the relationship between my fiance and myself too... I cant wait till sunday at 5:30 when he leaves to bring them home.