Tricouni is a nice area to explore. With a bit of clearance and decent tires and you can get close to the lake.
Ashlu is good as well. Good amount of exploring to be had out there. Parking at the old mine area and exploring on food is fun.
Stawamus/Indian FSR has some loose sections. Nice cruise out there. The washout at 24km is a bit rough. Only recommended if you know what your doing and have at least a second truck if things get exciting. Made it across with my Frontier this summer but had to pull a friend through with his Tacoma. We left a third truck on the Squamish side just in case.