Ive got a kilt
You wont have any trouble understanding people in Inverness, the accent is very clear. People in the North East or
Glaswegians might be a bit more difficult tho. Inverness is nice, if your going to Culloden battle field it will be worth while checking out Clava Cairns beside it and the spectacular railway viaduct. Urquhart Castle on loch ness should definatley be on your agenda.
If Mr Eliza likes pubs id reconmend he goes to "hootannys" in Inverness - its a Scottish celidh pub that has live traditional music every night. If you have time a visit to isle of Skye is worthwhile, the scenary is amazing.
Also Scotlands capital Edinburgh is a good place to be in the summer as its buzzing with street perfromers and all sorts of shows/entertainment during the Edinburgh festival. Theres also the military tattoo at the Castle where im sure youd see plenty of kilts :P Edinburgh is about 2 and half hours by train from Inverness. If your into Scottish history go to Stirling, you get a spectacular view from the top of the Wallace monument and you can see his actual sword.
I could go on forever about places to visit...