How to Get Out of State Travel Restrictions for Visitation

My question involves a child custody case from the State of:California

I’m about to start divorce proceedings. Most likely, it will be a non-contested divorce. However, I’m deeply concerned about my (soon to be ex) husband’s emotional state and, if at all possible, would like to place some restrictions on visitations and overnight stays. Specifically, can I restrict my ex-husband to take my kids out of state to visit his relatives?
Thanks in advance!

You have shared with us no facts that would support such an order by the court. You can try to negotiate with your ex- for such an agreement, but if he says "no" (as he probably will) you will need to make a compelling case to the court.