I always find the etiquette for tipping abroad a minefield, particularly after my one and only trip to the USA where tipping seemed expected for everything! I'm booked to go to Iceland in August and have booked a private tour (my family only with a private driver for a day) plus a group bus tour. How much is suggested for a suitable tip? Google doesn't give much away. The trip is paid for by a small inheritance, we are not huge earners and the tours are extremely expensive so I want to get the balance between enough to be none offensive but something we can actually afford!