Hi, you probably should take something that is properly warm such as a good fleece as they are light but provide warmth if the need arises...as getting into May is winter in the South Island and potential snow - but Queenstown and its surrounds is one of the most beautiful areas in NZ and any snow will just add to the beauty..as will any autumn colours so yes of course dont not go in case it rains!...and that is why NZ stays green and beautiful of course!
but back to my first train of thought...if you do meet with really cold weather you can just take advantage of being in a country with a major wool industry and buy something to wear and take home as a great souvenir!
If you come in winter, thick woollen socks and water proof shoes/boots, if your feet get cold and wet, its time to go back to your room. You can also get great little heat packs that you can shake and slip into shoes, if you put them by your toes especially, your day will be so much more enjoyable.
Toiletries and Medical Supplies: A good moisturiser and lip balm as it can be very dehydrating in Queenstown and surrounding mountain areas.
Camping/Beach/Outdoor Gear: If you go camping or to some of the fishing spots nearby you definitely need insect repellent and citronella candles, or repellants that you can burn work well too against the sandflies.
Miscellaneous: Also, remember good sunglasses, for when your relaxing at a cafe, even in winter, as we get alot of clear sunny days.
Luggage and bags:
We took backpacks although I have seen people with suitcases. It really does depend on what you are doing however if you are taking public transport at all or staying in a backpackers then a backpack is much more portable than a suitcase!
Clothing/Shoes/Weather Gear: Queenstown is a destination that is popular in summer and winter however you obviously need different gear depending on the season and what you plan to do.
For winter you will need snow gear (jackets and waterproof pants), scarfs, gloves and hats are recommended. If you are skiing or snowboarding it is cheaper if you bring your own however you can hire. Make sure you hire in town though as it is cheaper.
If you plan on doing any serious hiking then please refer to the Department of Conservation website for recommended gear for each track.
Toiletries and Medical Supplies: All of these things are available if you don't want to bring your own
Photo Equipment: All of these things are available if you don't want to bring your own
Camping/Beach/Outdoor Gear: If you get to Queenstown and find that you are missing something vital then don't worry as there are excellent outdoors retail outlets in town. New Zealand's homegrown retail store "Kathmandu" is highly recommended.
Miscellaneous: You can always email me if you have any special questions!
Bring good hiking shoes if you plan to climb the hills around town. If you are coming in winter, you will need to dress warm - it is cold during the day and can be freezing here at night.
Toiletries and Medical Supplies: You should be able to find what you need in town.
Photo Equipment: If you forget to bring your good camera, you are wasting your trip. You can still buy a disposable camera or film if you run out.
I forgot to pack my gloves and I regretted it in the early morning in Queenstown. I was there in autumn (April), so imagine what it's like in July - the middle of winter!
Photo Equipment: Beacause of the cold, make sure you have a spare set of batteries for your camera. They die quicker in colder climates. You can get them in Q'town, and they're not much more expensive than you would pay elsewhere, but if you got stuck in the middle of some scenic beauty spot in the middle of nowhere without a spare set, you would be cursing!
Clothing/Shoes/Weather Gear: I was there in the winter, and it was cold (It never got above 4 C.). Although it did not snow until my last day, it preceeded to snow for 10 days straight after I left.