What should I do to stay on track for upcoming trip?

Probably not the advice you want to hear, but if it were me I'd just try to be reasonably sensible about eating during the trip, fit in some fun extra activity if that's workable, and have a few treats within reason as part of the enjoyment.

I feel like the routine habits we follow day-in day-out the majority of the time are the power tools for managing body weight. Our long-term plan - handling not just loss but maintenance after reaching goal weight - needs IMO to include some way to manage special events, but rare/unusual events are a drop in the ocean. Those routine habits are the ocean.

When I go on vacation or have other unusual food-related events, I eat more than my usual as part of the enjoyment. Like I said, I try to keep it reasonable, not treat it as an excuse to eat/drink every single thing on offer. I lost weight from obese to healthy weight 9+ years ago, and have been at a healthy weight since, admittedly with some mild, gradual ups and downs all in the healthy range and same jeans size during these maintenance years.

You can manage your life in other ways, because personalized plans are IMO a key success factor. But the above paragraphs describe what I'd personally do. YMMV.

One thing I think has to be part of it: Whatever the current (sensible) weight loss plan is . . . back on it absolutely immediately once the trip or other special event is over; back to those routine day-in day-out health-promoting habits.

Best wishes