Kev is absolutely right Michael. It is a great trip but very tiring and bumpy. Also bear in mind that it is extremely hot at this time of year. Depending on how your partner feels, it might be worth considering doing a few trips independently of the rep, as that way you can go at your own pace and stop when you feel like it. You only have a week and although it is great to see something of the country whilst you are there, rest and relaxation will no doubt be high on your agenda. Monastir is well worth a visit, both for the wonderful mausoleum of the late president and for the harbour and medina. You can get a train from Sousse - the metro is just past the port at Sousse. Tunis is also easy to get to on the train, but don't travel in the rush hour as it makes the Northern Line look like a picnic.
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Transport is extremely cheap, including taxis, though you need to haggle and agree a price on these. Greet the driver in Arabic (aslemma means hello) say where you want to go then 'kadesh?' (how much?) Whatever he says your answer is 'la, ghali barcha' (no, too much). Knock quite a bit off and you will usually get a decent price. Walk away if it's still too much and find another taxi as there are always plenty about. Incidentally the tuktuks (little mauve things) or the Noddy Train are extremely cheap and good fun but also very bumpy and your partner will probably find the taxis much more comfortable. Have a lovely holiday.