17-day Spain & Portugal itinerary for my parents (April 2026) - too rushed or missing key spots?

Looking for feedback on this itinerary for my parents visiting from India in April 2026. They're both vegetarian, prefer authentic local experiences over tourist traps, and need moderate pacing (afternoon rest breaks essential). I'll be joining them the entire trip.

The Route:

• Lisbon: 6 nights (Apr 7-13)
• Lagos: 1 night (Apr 14)
• Seville: 3 nights (Apr 15-17)
• Córdoba: 2 nights (Apr 18-19)
• Granada: 2 nights (Apr 20-21)
• Madrid: 1 night (Apr 22, evening flight to NYC on Apr 23)

Travel: Rental car the entire time (Lisbon pickup, Madrid drop-off)

Questions:

1. Is 1 night in Lagos enough or should I add another and reduce Seville to 2 nights?
2. Should I cut Córdoba entirely and either add Ronda or spend more time in Seville/Granada?
3. Are we spreading too thin with 6 locations in 17 days, or is this reasonable given they'll need rest time?
4. Any must-do authentic local experiences in these cities for vegetarians? (Markets, neighborhoods, non-touristy spots)
5. Is April a good time weather-wise for this route?

Context:

• Parents are in their 60s, moderate walkers, not museum people
• Priorities: local daily life immersion, relaxed pace, good vegetarian food
• I'm based in Lisbon so that portion is sorted, but Spain advice especially welcome
• Alhambra tickets already booked for Apr 20

Appreciate any feedback - trying to finalize hotel bookings this week!