Absolutely, visiting Setúbal, Costa Da Caparica, and Cascais can be quite an adventure! Here are some travel tips for your journey:

Best Time to Visit:
The ideal time to visit these Portuguese destinations is from late spring (May-June) to early fall (September-October), when weather is warm and perfect for beach activities.

Route and Accessibility:
You can reach Setúbal, Costa Da Caparica, and Cascais from Lisbon by car or public transportation. However, a car is recommended for exploring the surrounding areas.

Altitude and Acclimatization:
Considering these locations are in coastal areas, you won't have any issue with altitude sickness. However, you should still keep yourself hydrated, as spending time on beach can dehydrate your body.

Accommodation and Booking:
These regions offer a variety of accommodations ranging from luxury hotels to budget hostels. Be sure to book in advance, particularly during the peak season of July and August.

Clothing and Essentials:
Pack light clothing along with a swimsuit for beach time. A sun hat, sunscreen, and sunglasses are musts for protection against sunburn. Don't forget comfortable walking shoes for exploring the old towns.

Health and Safety:
Ensure to have travel insurance that covers any potential health issues or accidents. Also, be aware of your belongings in crowded areas to prevent theft.

Local Etiquette and Respect:
Portuguese people appreciate politeness. Try to learn some basic Portuguese phrases to interact with locals. It's considered respectful to dress modestly when not on the beach. Respect society norms and refrain from overt public displays of affection.