Taipei, Taiwan.

* Clean and modern.

* Very safe.

* Nice people.

* Excellent public transportation.

* Good housing (relatively inexpensive).

* Great restaurants (extremely inexpensive).

* Low sales tax.

* Mandarin is a fun language to learn.

Also, $150-200 buys you a round-trip ticket to almost any other major city in Asia, so experiencing a new culture is just another way to spend a weekend. Taiwan's Eva Air and China Airlines are also excellent.