You don't have to be in Thailand to bargain. If rental agencies won't upgrade for free, you can try and negotiate. Premium cars can be very useful to get around in a city with long distances but without a reasonable public transport. Regardless of how useful they can be, premium cars can be very expensive. One way to avoid this paying too much for a car is to try and negotiate. Counter reps will negotiate much lower proces if they are available when you pick up your car. Ask at check-in if you can upgrade to a higher category and if they quote you a price, just try to bring the price down since they won't start at their best price.
Charge everything the night before you travel. Make sure you leave your phone, iPad, powerpod and laptop charging overnight and leave them next to your bag to make sure you pack it in your carry-on before leaving. You might find plugs by the airport or even use your powerpod, but it's best to have everything fully charged before you leave so you can avoid the hassle of staying in one place and charging it.
As airplanes are full of germs, make sure you carry a hand sanitizer and a tube of Bacitracin. Sanitize your hands and then out a dab of Bacitracin on your finger tip and use it to coat the inside of one nostril and then the other to ward off any virus encapsulated in the comprised air of aircraft.
Get some ear soft foam disposable earplugs which are cheaper, less bulky, easier to replace than the expensive, noise-canceling, bulky headphones. They also allow you to sleep comfortably.
If you have to eat at the airport, look for where the airline personnel are eating and follow their lead. Then choose protein over carbs as it takes longer to digest and burn, and therefore lasts longer. Also choose bottled water as your preferred beverage since soda might give you a bad stomach while flying.
The folding tray table is rarely, if ever, cleaned. Therefore, it is recommended to take some antibacterial wipes and wipe the try before using.
Get a wireless broadband USB modem, such as those made by Sierra Wireless. The wireless USB modem uses any cell signal so you can use it anywhere and you pay one monthly fee.
If you have a claim to a premier status, get in premier line. Get in any queue with more male solo business traveler. Men have fewer accessories to discard and are in a rush through to get through security. Avoid queues with families, married couples and leisure travelers.
Even if it is not on your itinerary, include working out in your routine. This will keep you healthy, it will battle stress and it will give your more control over your trip as it clears your mind. It will also help you battle jet lag and tiredness.
Finally, buy a local paper. This will make you look more like a local and less likely to be targeted by any unpleasant character that may be around. Besides, you might even learn something from this paper, so bonus.