Holiday on Lewis.

I wonder if any one on the island of Lewis can help me I am going on holiday to the island on the 5th of June.we have got a single level house to stay in and I am trying to find out if there are any walks,rolls that I can.take my rough terrain mobility scooter on.I can walk short distances and Basicaly function from the waist up.I will have my hand controlled car with me.I have been on Lewis and Harris before but I was fitter then.I can not recall if the streets of Stornaway were smooth or an assault course of monster curbs.The logistics of transfer from car deck to passenger space on the ferry might well be interesting