There is not much threat from other people in Andorra, but keep safe on mountains. Don't go too high without knowing what you are doing. See Altitude sickness for more.
Drivers are warned to avoid crossing back into France if the Spanish side of the Pyrenees has enjoyed beautiful warm sunshine all day and the road temperatures drop considerably towards the evening - there is danger of black ice from ice melt. The weather in the French Pyrenees is frequently vastly different than that of Andorra and the Spanish Pyrenees. Stay overnight if necessary, as cold morning temperatures are more apparent and less treacherous than sudden evening icing.
In Andorra La Vella there is the famous Caldea to visit which is a spa / swimming pool complex. This is very popular. It is located up the top end of Andorra-la-Vella and you cannot miss it because it is the large glass spire structure which is quite an attraction on the skyline itself.
The main hospital in Andorra is the Meritxell pronounced merichai Hospital +376 871 000.
Internet Andorra is a well-connected country, and has accepted the Internet with open arms. Almost as many people subscribe to the Internet as own landline phones.
Postal Service Andorra relies on the Spanish and French postal systems. The main office for both are located in Andorra La Vella.
The French post office CORREUS FRANCESOS located at Carrer de Bonaventura Armengol AD500 Andorra la Vella, Andorra (http://maps.google.es/map...) is usually open from 8:30AM - 2:30PM Monday - Friday and Saturdays from 9:00AM - 11:59AM Tel: +376 820 408
The Spanish post office CORREUS ESPANYOLS is open from 8:30AM - 2:30PM Monday - Friday and Saturdays from 9:00AM - 1:00PM Tel: +376 820 257.
Visitors should note that since Andorra is not part of EU/EEA, using mobile phones may be a lot more expensive than in France or Spain.