Logistics when renting a camera

Hi,

Are you sure you want a full frame camera. You can opt for a crop sensor as well, I believe you will get it cheaper. You are going for 7 day trip. Any way if you want to go ahead with full frame, then get an all purpose 24-70mm F2.8 or 4 (Tamron 28-75mm f2.8 is also a great option) and a long zoom in of 70-300 range. Skip the 35 mm or 50 mm altogether. If opting for a crop sensor then get a 17-50mm again from Tamron instead of 24-70mm.

The Sony cameras have internal high buffer, so any class 10 memory card will suffice, unless you are shooting some fast pace action. Get two 32/64 GB cards. Always keep 2 SD cards with you.

If you are getting a camera, they will give you battery and charger. If you are going to a very cold region then get one additional battery. Li-ion batteries deplete fast under cold conditions. Keep the additional battery in close contact with body for adequate warmth.

Although, the rental places do keep bags as well, I would strongly suggest you to buy a good backpack to keep everything safe. Travel light, look out for bags with dual separate compartments, lower portion dedicated to camera gears and upper compartment for food, jackets and other items. Tamrac is a fine brand.

Most important, get a sling strap for your camera (black rapid type). There are quite a option available under 1K.

Thank you.

Crop sensor cameras are cheaper than full frame cameras. Their quality is not bad or cheap.
The lens are also heavy for full frame cameras. If you opt for crop sensor, you will increase your reach by 1.5x automatically.

Also, if you are new to full frame, you may have a hard time keeping things in focus with fast primes.

Any f 2.8 lens is plenty fast for the shallow depth of field. Primes are great for portraits but not a good choice for travel photography.

Fiddling with different lens is the last thing you would want to do on your photography sojourn.

Reach is more important for getting an extra stop of light. For more light just crank your iso then the post processing software will take care of it (DXO, Topaz and Lightroom all have excellent noise handling capabilities).

an expensive body won't just produce a better image, the technical knowledge (at least familiarity with the exposure triangle) and composition is what matters. you can get a dirt cheap body and produce excellent results out of it. the better the body the more complex it is to use. higher-end bodies are made for user-specific customization in mind and are made to fiddle with.

not trying to demotivate, but if it's the first time using a dedicated camera, it's better to just use the phone which you are familiar with. it already has an excellent camera and you won't be losing precious moments trying to fiddle with settings. and it's already something you have with you at all times. a dedicated camera is more of a learning tool and requires some amount of post processing work (unless it's something like the fuji film simulations), which i'd assume one wouldn't want when spending time with their family or friends.

on a side note if you want to experiment, renting an apsc body and a lens or two is quite reasonable. check with what kind of photos you wish to take and get a lens accordingly. a good lens with variable focal length is a great choice like @saikatck said but a prime is not a bad choice either. i've used a 35mm apsc for almost every photo and i get the kind of results i want.

ps: you might wanna look into fuji film simulations (fuji x weekly). you can get great jpegs directly from the camera with excellent colours and there are a lot of recipies to choose from.