When it comes to travel, every tourist's nightmare is choosing the right mode of transportation, in the cheapest possible way. Fortunately, Bangkok's got a lot of options and I guess I've explored most of it. With 2 massive airports, (Suvarnabhoomi and Don Mueang) all you need to worry is which flight to board.
The local mode of transport includes the Bangkok Sky Train(BTS), public bus and Taxi.But regular taxi is not a wise choice under heavy traffic, since the meter reading doesn't care if the taxi is on a run or stuck in traffic. If you are a solo traveller, it's better to opt for bike taxi(In India, it's a common mode in Goa). If you have a fully charged mobile and a traveller's Sim with Unlimited Data, (recommended) another option is to go for Uber or Grab(more popular in Bangkok). There is another great mode of transport, probably the cheapest of all. The Chao Phraya River flows through the heart of the city and pretty much every tourist attraction is within it's banks. So, the best way is to get near a boat station and cruise your way through the muddy waters.