Add per-leg sights menus; rename yosemite_sights to parks_sights

- Rename yosemite_sights.md -> parks_sights.md, broaden to cover both
  Yosemite and Sequoia/Kings Canyon
- Add sf_sights.md, la_sights.md, vegas_sights.md candidate menus
- Link all sights menus from README and itinerary

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

itinerary.md

@@ -34,8 +34,8 @@
 | Date | Day | Location | Notes |
 |------|-----|----------|-------|
 | Sep 19 | Sat | Daly City (SF area) | ✅ Airbnb check-in after 3 PM · KT picks up rental car at SFO |
-| Sep 20 | Sun | San Francisco | — |
-| Sep 21 | Mon | San Francisco | — |
+| Sep 20 | Sun | San Francisco | [See plan ↓](#sep-20--san-francisco-golden-gate--waterfront) · Golden Gate, Marin Headlands, Wharf (car day) |
+| Sep 21 | Mon | San Francisco | [See plan ↓](#sep-21--san-francisco-downtown--classic-sf) · Downtown, cable cars, Chinatown (BART day) |
 | Sep 22 | Tue | Yosemite | Check-out SF by 11 AM · Depart 7 AM · [See plan ↓](#sep-22--sf--yosemite-valley) · Wawona check-in (flexible) |
 | Sep 23 | Wed | Yosemite | [See plan ↓](#sep-23--yosemite--glacier-point--mariposa-grove) |
 | Sep 24 | Thu | Sequoia | Check-out Wawona by 10 AM · Drive Hwy 41 (~3 hrs) · [See plan ↓](#sep-24--yosemite--sequoia) · Gilmore Cabin check-in from 4 PM |
@@ -53,8 +53,36 @@
 
 ## Detailed Day Plans
 
+> **Option to look into — Alcatraz:** ferry from Pier 33, ~2.5–3 hrs round trip. No car needed. If the group wants it, best slotted into the **Sep 21 morning** (BART day) — reach Pier 33 via the F-line streetcar, then do downtown after. This avoids clashing with the Sep 20 morning, which Marin Headlands wants for the pre-fog bridge view. **Sells out weeks ahead — reserve early.**
+> **Mondays:** some museums (incl. the de Young) are closed — check before counting on them Sep 21.
+
+### Sep 20 — San Francisco: Golden Gate & Waterfront
+
+> **Sights menu:** see [`sf_sights.md`](sf_sights.md) for the full candidate list.
+
+*Car day — flexible for the north-side viewpoints BART doesn't reach.*
+
+- **Morning** Drive to **Marin Headlands / Battery Spencer** — the classic Golden Gate Bridge panorama; go early before fog and crowds
+- **Late morning** Cross back over the bridge → **Golden Gate Bridge Welcome Center** & Fort Point underneath
+- **Midday** **Palace of Fine Arts** → **Crissy Field** (bridge + skyline)
+- **Afternoon** Drive **Lombard Street** (the crooked block) → park near **Fisherman's Wharf**
+- **Late afternoon** **Pier 39** sea lions → **Ghirardelli Square**; dinner on the waterfront
+
+### Sep 21 — San Francisco: Downtown & Classic SF
+
+*BART day — park the rental in Daly City, ride in to skip downtown parking.*
+
+- **Morning** BART Daly City → **Embarcadero**; **Ferry Building** marketplace for breakfast
+  - *Optional:* **Alcatraz** — early ferry from Pier 33 (F-line streetcar from the Embarcadero); book ahead
+- **Late morning** Ride a **cable car** (California St line) over Nob Hill → **Union Square**
+- **Midday** **Chinatown** (Dragon Gate) → **North Beach** (Little Italy) → **Coit Tower** views
+- **Afternoon** **Alamo Square** Painted Ladies; optional **Golden Gate Park** (de Young / Japanese Tea Garden)
+- **Evening** BART back from Powell St → Daly City
+
 ### Sep 22 — SF → Yosemite Valley
 
+> **Sights menu:** see [`parks_sights.md`](parks_sights.md) for the full candidate list + seasonal notes (firefall, water levels, etc.).
+
 - **7 AM** Depart SF
 - **Morning** Tunnel View (Hwy 120 entrance) → Bridalveil Fall (5-min walk) → Valley View (Merced River framing)
 - **Late afternoon** Cook's Meadow Loop — 1 mile, flat, Half Dome framing, good golden hour