Hi Polly
I have ventured on to this trip on two occasions, The latest was back In April. With regard to your question How much money you will need.
I suppose it really depends on yourself and your spending habits to be fair. However things to note is that if you fancy using any of the spa treatments , massage etc Then some cash will be required. Yes you can get bye without any cash as one of my trip did exactly that. However if you fancy a drink after 11pm when the all inclusive finishes then the bars tend to become cash bars, And you may need some cash for any of the excursions. But I think you can have a really good time with about £200. If you do venture out of the hotel into one of the towns, or to any of the local shops, You will find things a great deal cheaper than the UK. And as a rough guide. for example a large beer in town will cost about £1.00 to £2.00 ( for the more popular imported stuff )
It is a great little hotel with Fab staff. Have a great trip
Andy