6. Buy tourism cards
City tourism cards get you into many attractions for one price, and stretch your sightseeing dollars. Typically, a pass costs as much as two or three museum entrances, but includes access to dozens of attractions. I’ve saved more than $100 in London by using them, $80 in Paris, and $30 in Oslo. Best of all, you can get them at the local tourism office and, as an added bonus, they come with free public transportation.
As an example, say you go to London for three days. The London Pass costs $122 (£81). If you combine the cost for seeing the Globe Theatre, Westminster Abbey, Windsor Castle, and The Tower of London, and an Oyster card (for the Tube), you've already got it paid for.