State park rangers are on full patrols now through Monday. They'll be checking on boaters and campers, to be sure everyone is following the rules.
They say last week was a busy one for rescues, with three near-drownings. And rangers say it's best to always know where you're on the lake.
State Park Ranger Mark Deleon said, "Grab a map, and kind of pinpoint the location of where you're at on that map so when you have an emergency you can tell 911 dispatch where you're at."
Fresno County Cal Fire is also on alert this weekend. They say to be aware of dry brush, and it's potential to catch fire. Officials say wildfires are up 50 percent compared to last year.