The first aid kit, you want this small but FULL. For me, I like to think that I could fall off a cliff and all I would need is that little kit. Ok, not quite - but it does need to contain at least the basics. So see below a list of what I recommend you taking away with you a trip anywhere, and a trip to exotic locations. Please note though guys I'm not a medical expert, so talk to your doctor or travel nurse if you're unsure. You can always consult your own countries websites for travel health advice from experts near you.
Paracetamol / Ibuprofen - good for all your pain killing needs
Plasters - for all those little scrapes along the way
Antibacterial wipes / antibacterial gel - keep it clean people, no infections please
Specialist Blister plasters - new walking boots are a killer without
Mini scissors - handy for cutting plasters to size or cleanly removing dead skin
Burn gel - for cooking burns or REALLY serious sunburn (redheads I feel your pain)
Antihistamine tablets - you never know when you're going to have a bad reaction to something new when abroad. It's best to have some just in case even if you know you're not allergic to something. Just one random plant could be a nightmare.
Imodium - you never know how your stomach is going to react to new foods and different spices. Just take some just in case, you don't want to be stuck on a 12 hour bus ride in this kind of predicament.
Dulcolax - it may also go the other way and you just can't go
Tweezers - great for pulling out splinters or tics
Bite cream - nothing worse than a bite that's itching forever
Rehydration sachets - dehydration is a bitch. You're going to be busy and not drinking enough. This is particularly emphasised in hot countries, if you know you haven't had enough or are getting regular headaches down one of these and you'll start feeling better. I always take a lot of these and they're great when recovering from a bad stomach or hangover.
Lady itch cream - girls, you just never know if it's going to happen and nothing is worse. Be prepared
Any personal medicine you need - if you have known allergies or medication take the appropriate medicstion, an epipen, the pill or other contraception if you're on it etc.
For More Exotic Destination
Malaria tablets - they can be expensive and can make you sick. The downsides suck but Malaria is worse. Your local travel clinic or doctor will be able to advise you which is best to take for your location and your budget.
Vitamin supplements- if you're somewhere really exotic you may not be able to get enough vitamins as you would in your normal diet. If you're going away for a long time, it may be worth throwing some in your bag. They're also great after a big night partying
Antibiotics - try and get some from your doctor before you go if you get tonsillitis, cystitis or another bacterial problem fairly often. Trying to find a good hospital with English speaking doctors can be difficult at times so it's best just to be prepared. While you can buy them over the counter in India and some other Asian countries, you're not a doctor and don't know which dose you need or which type of antibiotic you need.
Bandages - for more extreme scrapes and cuts, or for sprained ankles / wrists etc
Safety pins - always handy for something!
Remember though if anything isn't feeling right get yourself to a doctor or a hospital. At the end of the day you know your body best and if something isn't right. The above list is only meant to be the first port of call and the basic cover for issues you know and understand such as headaches and cuts / bruises. I know I always bang on about it but to keep having fun you really need to make sure you take precautions to stay healthy so you can keep exploring and partying to your little hearts content.