Thinking about a trip to Thailand.

[Baron Von Bangkok]

Ladyboys are present in all walks of life over here and depending on your looks and age you shouldn't have much trouble getting laid (for free) However this might take some pre game planning. Joining a few dating sites which focus on thailand etc.
If you're a little pushed for time and willing to pay for sex then Pattaya is most definately the place for you, a city with thousands of hot ladyboys literally roaming the streets for customers (money being the only deciding factor) Ladyboy bars are also very easy to find.
I would also recommend checking out Nana Plaza and the Guess Bar (sukhumvit soi 4) in Bangkok. A night with any of these beauties should cost in the region of 2000 baht.
Also check out the lb69 forum for lots of detailed information and trip reports