Excursions hack: Please delete if not allowed but I created a review for viator and got 15% referral code for friends.
https://mention-me.com/m/ol/hw3fu-naresh-ramaiya
Then use rakuten for an additional 12% cash back.
Get $30 after you spend $30. https://www.rakuten.com/r/RAMAIY3?eeid=44971