If you don't want to end up slumming it on the No.11 public bus to Djemaa el Fna central square, get us to book Marrakech airport transfers in advance of your stag weekend. A driver will be waiting for you at Menara Airport. You'll be driven direct to your guesthouse and picked up again on the last day with time to spare before the return flight.
If you don't like messing about in an unfamiliar city, Marrakech airport transfers are the way to go. It's not like you're backpacking and have loads of time to explore and suss out the public transport system! Return transfers to Menara make life simple. Why go to the trouble of hiring a car? You'll only have to find a parking spot, which is no joke in the middle of the medina!
Planning to wing it and grab a cab on arrival? You will run the risk getting ripped off by a dodgy taxi driver. Even if you agree the price at the outset, you may find one of the less than scrupulous cab drivers will fail to honour it on arrival.
This is one of those: 'you know it makes sense' situations. Book Marrakech airport transfers in advance and you'll be able to get the stag weekend started and end it on a stress-free note by not legging it back to the airport at the last minute.