Yes you can do Havana over night we are doing this on this trip booked in for 9 July 09
If you would like some deatils on hotel etc send me pm with email address.
approx details cost £250.00 each remember its 600 + miles for Holguin
Itinerary roughly from Guardalavaca;
Saturday; Collected by aircon bus about 06.30 from hotel , pick up at various other hotels then on to Holquin Airport (about 20 people in all). Depart about 09.30 flight about 1.5 hours and on arrival collected by another a/c bus (same wonderful guide all the way), drove past Castro's house, tour of Havana by bus & various highlights on foot; rum museum look out point etc. Luggage left in bus with driver guarding it at all times.
Lunch in nice local restaurant & more sightseeing on foot/bus to Floridita, cigar factory shops, old Havana, Hotel Nacional, sea front etc and then about 18.00 on to Hotel Melia? 5 star with ironing boards for 'posh' outfits, about 10 mins drive from centre on sea front for dinner & prep for Tropicana. Bus collected us from hotel at about 21.00; Trip only about 10 mins drive away. Great show ( no meals for us but bottels of rum, fizzy wine etc incl in price) then collected by bus and return to hotel at about 00.45.
Sunday; breakfast, pack & leave bags in coach; 10.00 check out followed by more sightseeing mainly on foot with guide; coach driver watched our cases in locker all day. Went to Hemmingway hotel, lunch, craft market & Museum of Revolution (only saw outdoor exhibits due to time restrictions).
Then some free time (about one hour) and our guide asked a local driver to take us out in his 1953 Pontiac;we paid hm £15 (he asked for £10) and it was amazing! A good drive around old Havana, 30 mins, in a very old battered car! Fantastic! Just asked on spec as this guy passed by as we really wanted to have a go in an old car! Cuban people are so lovely!
Met up again at about 17.30; bus to airport, (good little shops at both airports to buy drinks/snackls for plane), back at hotel about midnight (we were last on the route at Brisas). Price included all meals and some drinks. Take bottles of water (or cans of beer!) ; no food on plane and only water, lemonade or coffee available to drink in the air. We did not get choice of hotel; it was all in wtih the package; did you read the posting (not sure where) that says Nacional rooms are not so great unless you pay for the executive rooms?
You could always ask your rep but as you can see from the above itinerary, it would be very difficult unless you get taxis to meet up with everyone and a lot of the itinerary is 'fluid' but busy in terms of time.
Only one beggar spotted; an elderly woman who wanted a pen, so take lots as people are really short of them.