What should I do on vacation?
Pick the phase intentionally. A vacation can be a maintenance period, a looser but still structured week, or a true break. The problem is not choosing flexibility. The problem is pretending flexibility has no cost and then being surprised by the outcome.
Simple rules work well: protein at most meals, produce when practical, walk a lot, choose the experiences you actually care about, and skip default extras you do not care about. When you return, resume the plan without punishment. The goal is continuity, not compensation.