by Michael J. Shapiro | May 01, 2010

It isn't just the highest-profile cities that are optimistically anticipating more visitors as the economy improves. Each of the following U.S. destinations has more than 4,000 hotel rooms in the development pipeline, according to Smith Travel Research. STR's Comprehensive Pipeline Outlook (released in February) counts developments by metropolitan statistical area, including hotels in the planning and construction phases. Here's a rundown of what's in store.

Baltimore 5,070 rooms in pipeline
Baltimore will host Reed Travel Exhibition's inaugural Americas Incentive Business Travel and Meetings Exhibition in 2011, which likely will further raise the city's profile with domestic and international planners. Baltimore proper currently offers more than 15,000 hotel rooms, with 8,500 of them near the Inner Harbor and convention center. More than 5,000 additional rooms are in the pipeline for the Baltimore/Towson metropolitan area, in projects such as the 256-room Four Seasons in Harbor East, to open in 2011; the 75-room Inn at Penn Station, slated for a 2012 opening; and a 165-room Hyatt Place, to open in 2013.

San Antonio4,729 rooms in pipeline
San Antonio, with its picturesque River Walk, has 35,000 hotel rooms, with more than 4,700 to come. In addition to the new 1,002-room JW Marriott San Antonio Hill Country Resort & Spa, which has 140,000 square feet of meeting space, smaller properties are in the works and include the 285-room Embassy Suites San Antonio Riverwalk, set to open downtown in August with 6,300 square feet of meeting space. The 126-room Hyatt Place San Antonio-North/Stone Oak debuted late last month,  near the University of Texas-San Antonio.

Austin, Texas4,716 rooms in pipeline
Austin's popularity has grown in large part because of its arts and culture scene. More than 4,700 hotel rooms are on the way, adding to 26,000 rooms already available in the Austin/Round Rock area. A 250-room W Hotel anchors the $225 million multiuse Block 21 complex, to open late this year in the 2nd Street District. Also in the works: a Hyatt Place at Austin-Bergstrom International Airport, and the 160-room Seaholm Plaza Hotel, part of a $117 million redevelopment of the Seaholm Power Plant, which will include a pavilion, meeting space and direct trolley service to the Austin Convention Center.

Honolulu 4,203 rooms in pipeline
The city and county of Honolulu, which includes the entire Hawaiian island of Oahu and several smaller islands, could debut more than 4,200 new hotel rooms in the coming years. Aulani, A Disney Resort & Spa, broke ground at Ko Olina on the west shore in 2008 for a fall 2011 opening. The resort will offer 360 guest rooms, in addition to meeting space and an 18,000-square-foot spa. Later this year, Honolulu is slated to welcome the first Edition hotel, the new brand collaboration between Marriott and Ian Schrager.