Do rest your wrists at the edge of the table when eating.
Do put your knife and fork on your plate parallel with the handles facing to the right to show that you have finished eating.
Do give a high quality gift, such as brandy or whiskey, and bring a small gift for children as well. Open your gift immediately when receiving a gift.
Do be patient. The Spanish have a very relaxed view of time.
Do be aware that dining is important to business relationships in Spain.
Do make use of the public transport system. Well organised and one ticket fits all.