I hope that the barrier islands, such as Galveston, are evacuated. So far, it seems to be going well (fingers X).
The story of Galveston and the 10,000 or so lost on the island in 1900 is well-known on the coast, so people tend to be cautious.
The current wall at Galveston City is 17 feet, but does not cover the whole island.

*Population- Galveston County (part of Metro Houston)
250,000 total
White 189,000
Black 39,000
Other 18000
Asian 5000
Hispanics (any race) 48,000.
Household median income- $42,000 (county)
Per capita income
White- $25,000
Black- $13,500

Population- Galveston City (island)
58,000 total
white- 34,000
Black- 14,000
Asian- 2000
Other- 6000
(I didn't include Indians, Hawaiians, and other small groups counted separately, hence the disparity with the total)
Hispanic (any race) 15,000
Household median income- $29,000 (national average- $42,000)
Per capita income
White- $23,000
Black- $11,000
Asian- $17,000
Hispanic- $11,000

* all figures roughly rounded off. Not all figures for same year- most are 2003 est., some 2000. Figures from various Texas State sites.