If you are planning to do the Broughtons
It's a FANTASTIC area. Be sure to visit Billy Procter and his museum just around the corner (to the south) from Echo Bay - although Echo Bay itself is not one of my favourite places. Shoal Harbour, a bit south of Billy Procter's, is a fabulous Anchorage.
If you are going to do the Broughtons you DO NOT want to be going back and forth to either Lund or Pender. It's a couple of hundred miles, through ALL the rapids and down/up Johnstone Strait which you don't want to do any more often than absolutely necessary.
Use Port McNeill for your base. Very easy shopping. Everything you'll need, good fuel and water, an excellent marina, and a pretty good, and HUGE Anchorage.
Getting to Port McNeill by car is a major PITA - dealing with (and paying for) the Nanaimo ferry and driving up and down the Island Highway over 200 miles each way. FAR better to have people fly in and out of the Port Hardy Airport. There is a public bus that runs from Port McNeill to the airport (including a transfer) but if there are several people a taxi is probably a better bet. Flying
Portland - Vancouver - Port Hardy is probably cheaper, and sure as heck is easier, than driving up and dealing with the ferries (although the Anacortes to Victoria ferry is an option).
If you are heading up that way for the first time, do some
research on getting through the rapids. Get a copy of
Ports and Passes. It should be available in Portland as it's coverage area extends down there. It's tide and
current tables are MUCH better than the
government ones (don't depend on electronic ones. They can be fatally wrong!), has chartlets showing passes and harbours, and has tips on dealing with various things including running the rapids.
Have a great summer! We may see you up there.