Shake everyone's hand upon arrival and wait to be seated until your host indicates you can. Dinner may begin with a toast by the host and later during the meal the guest of honor may be asked to return the favor. Most other dining rules though are similar to the rest of Europe. For example, you should keep your hands within sight by resting your wrists on the table, you should eat in the continental style (knife in the right hand, fork in the left), and when you're finished eating, indicate that by placing your fork and knife together on your plate.
In some settings, there might be entertainment and dancing after the meal; this will be a great opportunity to show off your shoes and burn off some of those calories. This is also a great opportunity to fit in as you are expected to participate.
Even though a service tip is generally included on a restaurant bill, it is expected that you tip an additional 10% on top of this for a sit down meal at a nice restaurant in Andorra.
Drinks
In Andorra you will find many Catalonian specialties, including granizado. This beverage can be made from various liquids, including orange juice, lemon juice, coffee, or even liqueurs, then this liquid is mixed with crushed ice and blended until the drink resembles a thick puree. Other non-alcoholic drinks, such as juices, coffee, tea, and soft drinks are readily available in Andorra.
On the alcoholic side, wine is perhaps the most commonly drank alcohol, although beer and hard liquors are also available and popular. The wines in Andorra include locally grown wines as well as Spanish and French wines. Pinot Noir is the only varietal grown in substantial numbers in Andorra.
Generally speaking, the tap water is safe to drink in Andorra, but check with locals for any particular regional differences. Also, many people may have troubles adjusting to the local tap water, as it will most certainly be different from what your system is used to.