(CNN) -- As Americans gear up for the Fourth of July weekend, coastal areas affected by the oil spill in the Gulf of Mexico are working hard to keep beach-bound travelers informed.
Here are some of the latest updates from destinations affected by the oil disaster:
Waters east of the Pensacola Beach fishing pier and on the north side of Santa Rosa Island along the Santa Rosa Sound remain open.
A health advisory has been issued for Gulf waters west of the Pensacola Beach fishing pier to the Alabama state line, according to the Pensacola Bay Area Convention and Visitors Bureau. The advisory includes western Santa Rosa Island and all of Perdido Key. Visitors are urged to avoid contact with oil on shore and in the water.
"We are all heartbroken and concerned about recent impacts from the Deepwater Horizon incident but rest assured the situation on our beaches remains dynamic," said Ed Schroeder, director of Visit Pensacola, in a statement on the bureau's website.
The Okaloosa County Health Department withdrew a health advisory issued June 24 for Destin beaches.
"The oil impacts on our beaches are intermittent and can change within hours or within a day due to the dynamic nature of the currents and changing wind directions," the department's website said.
The department urges visitors to avoid entering the water when oil is present.
Large amounts of oil washing ashore prompted the Walton County Health Department to issue a health advisory Wednesday for beaches in Topsail Hill State Park, according to the area's Tourist Development Council.
"A health advisory does not represent a beach closure or restriction on beach access. Beachgoers are encouraged to exercise personal judgment as conditions can change quickly," the council's website said.
Meanwhile, small, scattered tar balls and oil patches have affected Panama City Beach, but the beaches and water are open, the area's visitors bureau website said.
Oil has not been reported onshore in the state beyond northwest Florida, according to Visit Florida, the state's tourism corporation.
Gulf Shores and Orange Beach have experienced significant oiling, according to the Alabama Gulf Coast Convention and Visitors Bureau.
"The beaches are open and visitors are still welcome to sunbathe and walk the beach, but we strongly suggest they swim in a pool or enjoy our many off-beach activities," the site said.
The Alabama Department of Public Health has issued an advisory against swimming in waters off Gulf Shores, Orange Beach and Fort Morgan, and in bay waters close to Fort Morgan, Bayou St. John, Terry Cove, Cotton Bayou and Old River.
Waters off beaches flying double red flags are officially closed.
Last week, the department also issued a no-swimming advisory for Dauphin Island and the Mississippi Sound.
South Mississippi beaches experienced significant oiling on Sunday and Monday, according to the Mississippi Gulf Coast visitors bureau.
Advisories have been issued for beaches in Jackson and Harrison counties. The beaches are not closed, but state officials "advise people to be aware of their surroundings while recreating." Visitors should avoid contact with oil.
Gulf Islands National Seashore
All of the Gulf Islands National Seashore sites, which are in Florida and Mississippi, are open, the National Park Service's website said.
But several spots have been affected by the oil spill, and a public health advisory is in effect parkwide.
"If you see or smell oil in the water or on the beach, avoid contact with water and report it to the nearest lifeguard or park ranger," the park service's website said.
Grand Isle, Louisiana
The oil's biggest impact in Louisiana is on the portion of the coast from the mouth of the Mississippi River extending east, according to a state emergency website.
"Most of the Louisiana Gulf Coast, 70 percent, is unaffected by the oil spill and remains open for commercial and recreational fishing," according to the Cajun Coast Visitors and Convention Bureau website.
Grand Isle has closed its public beach, the site said.