From Los Angeles:

Take I-10 E toward San Bernardino, Take Barstow/Las Vegas exit I-15 N, Get onto I-40 toward Needles, Take exit #9 Lake Havasu City/Parker, Turn right onto AZ. HWY-95. Turn right onto Industrial Blvd. to enter Park entrance

From Las Vegas :

Take I-515 S toward Phoenix/Needles, to US HWY 95 toward Searchlight/Needles, Turn left onto I-40 E, Take exit #9 Lake Havasu City/Parker, Turn right onto AZ. HWY-95. Turn right onto Industrial Blvd. to enter Park entrance

From Phoenix:

Take I-10 W to exit #19 to AZ-95. Make sure you stay on AZ-95 going North through Parker. Turn left onto Industrial Blvd. to enter Park entrance