Absolutely! Wales is a beautiful country with so much to explore in Cardiff, Swansea, and Aberystwyth. Here are some tips to guide your travel:

Best Time to Visit:
The best months to visit Wales are between May and September when you'll experience the warmest weather and the least rain. Spring (April to June) is also a pretty time to visit when flowers and trees are in bloom.

Route and Accessibility:
Cardiff, Swansea and Aberystwyth are all easily accessible by train and bus. You can start your journey in Cardiff, take a train to Swansea which is an hour away, and then a train from Swansea to Aberystwyth (about 2 hours).

Altitude and Acclimatization:
These cities are not at high altitude, so acclimatization should not be an issue. However, if you decide to visit Snowdonia national park while in Aberystwyth, prepare yourself physically as Snowdon peak is at high altitude.

Accommodation and Booking:
Every city has a range of accommodation options, from budget hostels to luxurious hotels. It is advisable to book your accommodations in advance, especially during summer which is the peak tourist season.

Clothing and Essentials:
Weather can be changeable, so it's advisable to pack a range of clothes suitable for both sun and rain. Walking shoes are recommended for sightseeing, and if you're planning to visit the beaches or do some hiking, don’t forget your swimwear and hiking boots.

Health and Safety:
The UK, in general, is quite safe for traveling. Follow the usual precautions like looking after your belongings and avoiding less crowded places at night. Standard health insurance is advisable.

Local Etiquette and Respect:
British people appreciate good manners. Always say “please” and “thank you”. Don’t forget to respect local customs and historical sites. In public places, maintain quiet and order. Always queue in a line and wait for your turn.