Sure, I'd be happy to provide some travel tips for your visit to Lisbon, Porto, Sintra, and Coimbra.
Best Time to Visit:
The best times to visit these places are during spring (March to June) and fall (September to November). The weather is pleasant and the tourist crowds are fewer.
Route and Accessibility:
These cities are well-connected by the Portuguese rail and bus network. Starting from Lisbon, Porto is approximately 3 hours away by train. The distance from Porto to Coimbra is 1 hour by train and from Coimbra to Sintra is almost 2 hours.
Altitude and Acclimatization:
These cities are all at sea level, so there's no need for acclimatization.
Accommodation and Booking:
Book your accommodations well in advance, especially if you plan to visit during the peak season. Lisbon, Porto, Sintra, and Coimbra all offer a range of options to suit different budgets, from luxury hotels to hostels and vacation rentals.
Clothing and Essentials:
Pack according to the season. Temperatures in Portugal can get quite hot in the summer, so lightweight clothing, sunscreen, and a hat are essential. For the cooler months, bring a medium-weight jacket and layers.
Health and Safety:
While these cities are generally safe, be aware of your surroundings, especially in crowded areas where pickpockets might be active. Carry some basic medicines and a first aid kit.
Local Etiquette and Respect:
In Portugal, it's common to greet people with a handshake. When eating, keep your hands on the table (but not your elbows) and remember that tipping about 10% is standard in restaurants. Public behavior is generally conservative.
Remember to respect historical and cultural sites. Portugal is known for its beautiful tiles (azulejos), but these should be admired from a distance as it's illegal to damage or remove them.