Rio gives the biggest range as well as an awesome holiday, provided you can cope. You need to manage when most people have very limited English, be able to plan and resesrch accurately, and not get yourself into trouble. It is no longer a cheap destination but you could do it by renting an apartment carefully. It has probably the most mind-boggling terma end of quality girls eager for cock, a low end where (in spite of the BBC program on another thread) you can get a quick fuck for under a tenner, and a quality mid-range that is under half the going rate for similar in this country. It is easier to navigate than other S.A. countries (BsAs excepted) but still very challenging. The sheer variety outperforms any other country I can think of.
For an easier option, you could do a lot of shagging and safely in Europe and the main cost will be hotels. The girls are less enthusiastic but perform well and no legal or safety worries generally. Finding your way around and language problems are a challenge but not a huge one.
Anywhere is a change from Thailand but Angeles City is a nice holiday and you can always move to the coast if you get bored. Now do some research. These type of threads usually deteriorate into one line questions wanting pages of answers. If you need that much help without demonstrating your experience then you'll unfortunately be labelled a time-waster.