This time of year I doubt you will find anywhere in the MB area that is not too busy. I was kilted there this past March and got no comments good or bad. Just a whole lot of people trying to sneak pictures on their cell phones. I didn't find anywhere that was particularly kilt friendly but keep in mind their whole economy is geared to tourism so they have to be somewhat friendly to everyone. I'm sure they get ALL types during the summer months.

While there, I did check about for an Irish pub and only found 3 or 4. The only one we managed to visit was Blarney Stone's in the Broadway at the Beach complex. I don't think they ever saw a kilt before but it was fairly quiet and they had decent food.

If you are staying on the north end (the Strand area is at least 30 mi. N to S), I will recommend House of Blues. The food has been excellent every time I have visited, and the atmosphere is incredible (although they don't really play Blues music while you eat any more.) To the south, I would say to check out the Murrell's Inlet area. There are multiple excellent restaurants with bay views all connected by a small waterside boardwalk. Also to the south, at Surfside Beach pier, there is a small restaurant called Nibbles that has incredible breakfasts. They have a nice ocean view. It is run by a family of Irish descent and definitely has that feel to it.

If you what any more info, feel free to PM me. My mom has been spending a month in MB every year for the last decade+ and she is very good at finding restaurants so I have eaten all over the area. That's the problem with MB, you gain too much weight to fit into your kilts.