For your security, Thailand is as safe as any other country. So don't be scared, tourism is the main income in Thailand and Thai authorities do not want to loose you.
Concerning the heathy conditions, it's different, tourists can become sick like any other countries in the world and before going to Koh Chang, be sure that you have all the needed injections as well as having a good travelling insurance. In case of accident it will save you a lot of troubles and money; costs in private hospitals are quiet high, especially if you need to spend few days there or need to return to your home in emergency.
The 4 biggest risks in Koh Chang are motorcycles accidents, sunburns, mosquitoes and food poisoning:
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If you start to feel sick, do not wait that it becomes worse, go directly to a drugstore and describe your symptoms. They will give you medicines and if after a couple of days it's still the same, ask to to see a doctor.
There are a lot of drugstores along the island.
There is a very good dental clinic in Koh Chang, very modern with excellent dentists. Depending from where you are coming from, they can be much cheaper.
Like the drugstores, there are also a lot of optical shops. They don't sell copies like street stalls, only genuine products. All of them are proposing good discounts if you buy one, two or more pairs. They can also check your eyes and make the glasses you need.
Contact lenses are also very interesting. They normally sell DUNA Life which is manufacture by Baush & Lomb Ireland.
Some of them will offer you refreshment while you are trying the different models.
Optical shops
Optical shops have very often attractive offers
https://picasaweb.google.com/108270622588225169107/WhiteSandBeach#6008514544425965874
Optical shops do not sell copies
https://picasaweb.google.com/108270622588225169107/WhiteSandBeach#6008144535537287906
Large choice
https://picasaweb.google.com/108270622588225169107/WhiteSandBeach#6008144518522635442
Some of them offer you a refreshment
https://picasaweb.google.com/108270622588225169107/WhiteSandBeach#6008514475311823362
They test your sight before and after getting the glasses
https://picasaweb.google.com/108270622588225169107/WhiteSandBeach#6008514460839742658
(5 pictures in the gallery)
Cosy and luxurious villas with a private swimming pool and a garden in a quiet area and for 6 adults.
All the fitness and workout equipment in a spacious gym and located in the north of Klong Prao.
From Bangkok to your Resort in Koh Chang, from 3,700THB per way, for 2 adults, including ferry tickets.
One of the best Resorts of the island, a small piece of Heaven with its 260 meters long beachfront.