Little Marines (1990)

3 friends named Stevie, Chris, and Noah get out of school for the summer and decide to take a trip camping. Along the way, they run into obstacles such as a drug dealer, mischievous little kids, and a "Killer" dog. The boys also have flashbacks of a friend named Matt, who died one year earlier to cancer. They also visit his grave along the way. When they arrive at their campsite, they notice a "Snake, Keep Out" sign on a fence. The "Snake" is a man dressed in black who rides a motorcycle and terrorizes people in the forest and the campsites. The boys also run into a lonely man who lost his family and befriend him.