Spending money for two weeks in Thailand?

[NotTheDoctor]

2 adults staying b&b (already paid for) in krabi. We'd like to do a few island trips, elephant/kayak trek, horse riding etc but a few days doing nothing too. How much should we take?

obviously you don't take, just a float and you use ATMs which are EVERYWHERE. But do make sure your bank knows where you are.

I see it is about 50 baht to the pound at a moment. Street food etc v. cheap, drinks are not.

where in Krabi? Big province, obviously this affects price of trips.