Assuming you're taking the counter-clockwise route around this trail, you'll want to bear left at this junction.
The pine shaded trail that you've been hiking through continues on the return loop, though becoming a little thin at times.
Also much of the hike has been very flat and level up until this point, and from this point you're going to be encountering some elevation gain. Knowing that the inviting waters of Summit Lake await you at the end of this 11 mile hike might be the reward you need to carry you over this return loop.