Get out of the university square.
Go to downtown riverside. : back to the grind is nice coffee shop with music nights during non covid. and there are a ton of bars, both low class and $$$$. Also downtown has gamelab with a decent pinball selection and video arcades, also vr and a small selection of japanese import games no scrup scrollers though. It’s right next to the foodlab.
Go to fairmount park and fed the ducks.
Climb “mt” Rubio.
Go for a bike ride on the river trail.