In the immediate vicinity, there is Minter Gardens and Bridal Veil Falls, about 20-30 minutes away south of Agassiz. The cities of Abbotsford and Chilliwack are also nearby.
Further east is the scenic Fraser Canyon, the town of Hope and Manning Provincial Park, which offers hiking, camping and other recreation opportunities. If you're looking to return to Vancouver and have some time, you may want to take Highway 7 which is slower but more scenic particulary the piece between Agassiz and Mission.