Welcome to the group and congrats on the upcoming surgery and all the pre-op success.
I have not traveled to Peru, but I did go to Mexico about 9.5 months post op. Honestly it wasn't difficult at all. Typically by 8 weeks you should be healed on the inside and cleared for pretty much all movement. So by 6 months you'd be fine - generally speaking.
I would say just packing all your vitamins and supplements is key of course. I also packed snacks mainly for the actual travel part - plane and car rides. I had jerky, cheese crisps, protein bars, portioned nuts and low carb chocolate. I had more than I really needed, but it definitely helped to have options. You could also consider protein powder or shakes in case. Also a reusable water bottle/cup comes in handy to ensure you stay hydrated.
I stayed at an all inclusive resort and there were many healthy fresh options for all meals. The buffet breakfast had a ton of fresh fruit and veggies, a bunch of egg options - egg whites, hardboiled eggs, etc. and the meat protein options, yogurt and cheeses. There were various milks both dairy and non dairy options. Dinner menus had accommodations for different dietary needs. Off resort also wasn't difficult to navigate as there is a lot of protein and veg options.
I found getting in movement was not difficult either. There was a gym, aerobic classes and water sports. But honestly walking around the resort, the pool, walking on the beach, the walking tours off resort - i never missed an exercise goal.
The variables can happen depending on the area you are staying I'm sure, but I have friends who frequently travel to Peru to visit family and frequent many local cafes that have plentiful healthy options - healthier than you find in the states unless you grow it yourself since a majority is local and doesn't have to travel far at all.
You will not likely be able to get exact specifics of macros if you like to track your food, but by 6 months you'll have an idea of estimated protein amounts and general portions for most foods you are likely to eat. As long as you stick with protein first, then veg and carbs last you should be good.