Check these sites. There is so much to do. For sure don't miss Havana most tourists I've met agree it's the highlight of their visit. Below are some excursion prices. Have a wonderful time. Since you are from if you are from the U.k. take Sterling. For sure don't take American. Check the site below for approximate rates. You will use the Convertible Peso (CUC) it's used by tourists. you can't buy it anywhere except Cuba.
http://www.oanda.com/convert/classic
expect nice hot weather, great for the beach and touring. The site below has an almanac for past years.
http://www.wunderground.com/cgi-bin/find…
Here is the excursion price list from Sun wing Vacation as of Jan 2009 :
Havana one day 67 CUC
Havana History & Rhythm 99 CUC
Havana special 135 CUC
Catamaran 99 CUC
Dolphin Swim 89 CUC
Boat Adventure 45 CUC
Jeep Safari 71 CUC
Tropicana Varadero 49 CUC
Matanzas Yumuri 45 CUC
Trinidad 75 CUC
Source(s):
http://www.gocuba.ca/en/index.asp
http://www.cuba-junky.com/
http://www.cuban-beaches.com/matanzas/va…
http://www.havana-guide.com/
http://varaderobeach.blogspot.com/
Edit: Amazing, everyone who gives decent thoughtful answers gets thumbs down! Not hard to figure that one out.