View from the trailhead in San Mateo Campground nearby the ampitheater, looking toward the ocean.	Walking down the trail towards Trestles, view looking back towards Camp Pendleton, part of San Mateo Campground is visible through the trees.	Continuing down the trail, getting closer to San Mateo Creek another view looking back toward San Mateo Campground and Camp Pendleton.
The trail then goes uphill again, looking back from this point a view of San Mateo Campground.	The trail then swings back along San Mateo Creek.  This creek is home to a number of endangered animals and native plants.  The area around San Mateo Creek is also a sacred Native American site.	Continuing on, looking towards San Onofre State Beach and Trestles, San Mateo Creek is now more visible.
A view of San Mateo Creek looking back toward San Mateo Campground and Camp Pendleton.	View looking towards Trestles, getting closer to the I5 freeway.	At this point the trail starts to descend down to the I5 Freeway undercrossing.
The trail is now just above San Mateo Creek.	The I5 Freeway undercrossing.  Both the abandoned old Highway 101 and I5 were constructed before any coastal protection laws were in place.	Passing underneath the I5 Freeway, extremely noisy here.  The traffic noise is not heard from San Mateo campground as the freeway is far enough away.  Looking beyond the I5 undercrossing is the old Highway 101 bridge.  Continue to follow the paved pathway beginning at the Trestles Board and Nature Preserve--All Features Protected sign.
Trestles Beach.  View looking back toward the train tracks which gave Trestles Beach its name and toward the lagoon at the mouth of San Mateo Creek.	Trestles Beach, this section is Uppers.  Great surf breaks here.  The famous Trestles surf is formed by the sediment and cobbles moved down the San Mateo Creek into the ocean which formed a reef over the years.  The creek floods about every 50 years, moving rock and sediments out to sea.