Start at Mission Inn Hotel & Spa around 4:30 PM, when the light is especially good on its Spanish Revival façades and tiled courtyards. The exterior and public areas are free to explore, while guided historical tours typically cost about $15–$20 and may have limited availability, so check the hotel’s schedule before arriving. Allow roughly an hour to wander through the arcades, admire the stained glass, and peek into the lobby’s wonderfully over-the-top interior. From there, Riverside Metropolitan Museum is a short walk through Downtown Riverside; verify its Saturday hours before setting out, since late-afternoon access can be limited. If open, spend 45 minutes with the local-history and art displays. Both spots are easiest on foot, with paid street parking and downtown garages nearby.
Walk or drive a few blocks to The Salted Pig for dinner around 6:30 PM. Expect about $25–$40 per person before drinks, with creative gastropub plates and a lively downtown atmosphere; reservations are sensible on a Saturday evening. Afterward, allow 10–15 minutes by car to reach Mount Rubidoux Park in West Riverside. Aim to arrive by 8:15 PM, bring water, and use a phone flashlight for the return if dusk comes quickly. The paved summit route is moderately uphill but manageable, and the cross at the top provides broad views over Riverside and the Inland Empire as the city lights come on. Parking near the trailheads can fill at sunset, so arrive early rather than relying on the closest spaces; stay on the marked paths and descend by about 9:15 PM.