We think it’s always a good idea to have more money than you need for a trip, just in case of an emergency. Having $100 per day on top of the hotel and travel (flight or car) you’ve already booked should cover you, but if you know you’re someone who likes to buy souvenirs or indulge in cocktails or taxis, you could ways budget more. Also, booking and paying for things ahead, like tours or tickets, will help alleviate what you need to pay for during the trip.