I have been there many times, in fact I'm going back in 4 weeks and this will be my 4th trip down there in just over a year. I started going there about 18 years ago and have learned alot since then. IE: Don't buy cigars off anybody on the beach or street. No matter what they tell you, they are crap. Only buy from stores. Don't even think about trying to buy weed, of any other party favours. This place isn't like any of the other Caribbean counties where every 2nd person is trying to sell you weed or cocaine. Remember, the secret police are very much alive and well in this country. Don't bother with american money. Just take your Brit. pounds and exchange it at the hotel or airport. Cuba no longer uses US dollars as a base for their currency. They now use CUC (Cuban Convertable Pesos) for the tourists. These can be spent anywhere that regular Cuban pesos can be spent. Right now the exchange rate for CUC to Canadian dollars is right around 1 for 1. In March I believe I was paying around $1.04 Can for 1 CUC. If you are staying at an all-incl. resort, which I'm guessing you are, a peseo tip here and there goes a long way. It's really amazing how some people get really upset when I seem to get my drinkis a little quicker than them at the all-incl bar. LOL. Unlike most other caribbean countries, you will feel real safe there, even out at night. Crime rate is very low (in my expearence) as most locals are VERY afraid of the police. But thats not to say "don't use your head while having a few cocktails and being out at night". Ican't think of anything else right now, but if you have anymore questions, please feel free to ask. I'm no self proclaimed expert on Cuba, just a guy thats been around. Hope this helps.
Al