Service charges are included on all restaurant bills at a cost of between 10 and 15 percent. Extra tips are accepted of course if you have received above good service. s fair to add a little more if the meal and service has been exceptional. Taxi drivers expect tips of about 10 percent of the fare. Hairdressers will expect about 10% also. Porters, doormen and room service can be offered a small gratuity.
Banks and exchange bureaux give better exchange rates for traveller's cheques than for cash; Banque de France offers the best rates in the country. France's ATMs are plentiful and accept all the major international credit and bank cards. I believe though if you have a card with more than a 4 digit pin, you may have a little trouble with the machines there.