Solo day hike starting at the San Antonio Falls Trailhead.  Followed AllTrails Mount San Antonio and Mount Baldy Notch Loop Trail going clockwise.  I don't think I drank enough water this week because it's the first time I've felt altitude sickness that last 1000 feet.  The day was warm, but not too hot.  A bit crowded on the trail, but the sky was clear and the views were great.  The going down after the peak was hard on my toes.  I should have tied my shoelaces for a more steep grade decline.  Overall, a really great day.  Everyone on the trail was great.  And an ice cold beer at Top of the Notch restaurant on the way down was amazing!  Definitely recommend!