Alaska 7-night routes from San Francisco, Seattle, or Vancouver.  You’ll see glaciers, fjords, and plenty of wildlife, especially otters and whales. There’s crowding in many port towns, and the region gets a lot of rainfall. 
Asia - Andaman Sea

3- to 7-night routes from Singapore, Malaysia, and Thailand.

Stunning temples and unforgettably flavorful Asian cuisine.  Many beaches —  except Langkawi’s — are narrow and overrun by reckless jet skiers.
Asia - Gulf of Thailand and South China Sea 10- to 14-night routes from Singapore or Hong Kong to Vietnam and Thailand. Expect gilded temples, diverse and delicious cuisines, and great shopping. Some sights are a two- to three-hour drive —  one way!  — from the port. 
Baltic 7- to 14-night routes from Copenhagen, Amsterdam, Harwich, Dover, or London (Southampton) to St. Petersburg, Russia, and Baltic ports or the Norwegian Fjords.

Gilded St. Petersburg charms us, as does the beauty of the Norwegian fjords.

Expect long lines at key sights in Russia.
Caribbean - Eastern 7-night routes round trip from Florida or Puerto Rico.  There are gorgeous beaches throughout the region, and plenty of snorkeling and diving.  You’ll find overcrowding and traffic in port towns, as well as shopping areas designed just for tourists.
Caribbean -Southern 7- to 14-night routes from Puerto Rico, Barbados, or St. Martin.  Fewer crowds than eastern and western Caribbean, and excellent beaches. Longer — and sometimes more expensive — flights home.
Caribbean - Western 7-night routes round trip from Florida, Louisiana, and Texas.  Mayan ruins and great silver jewelry shopping (in Mexico), and eco-excursions on most routes, from jungle hikes to kayaking, tubing, snorkeling, and diving. Overcrowding and traffic jams in port towns, as well as shopping areas designed just for tourists.
Mediterranean - Eastern 7- to 14-night routes from Venice, Istanbul, or Piraeus (Athens) to Turkey, Greece, Croatia, and Italy.  Important historic sights date back thousands of years. Venice, Athens, Istanbul, and Rhodes are packed in the summer, and Italy is expensive.
Mediterranean - Western 7- to 14-night routes from Barcelona or Civitavecchia (Rome) to Spain, France, Monte Carlo, and Italy. Look for spectacular food throughout the region. Barcelona, Rome, and Florence are home to significant artwork. It’s an hour’s drive to Florence and longer from port to Rome. August is peak tourist season, and what isn’t closed, is packed.