We live on one of the Discovery Islands off Campbell River. Of grid, no ferry service etc. We have lots of room for your boat and trailer. Very safe, no charge. But you'll have to barge it over here. Or just bring the boat and tie up at our dock.
That said, I know there are a few commercial places around that might work for you. Here are a couple of websites:
http://www.salmonpoint.com/rates.html
http://www.chucksboatrvhauling.com/
The first one of those advertises day storage for $8/day.
The second one, Chuck’s, says nothing about short-term storage on its website. So I called Chuck this morning.
He was taken a bit off guard when I asked about short-term storage - apparently not his usual business. But he said he could do it. I asked what he would charge for, say, 5 to 7 days. He did not quote a daily rate, and I did not press for same. He said maybe $100 for a week. But he was obviously open to negotiation.
Chuck’s is located at Black Creek, about 30 minutes south of C. River. If that location suits better than the first one (and assuming you find nothing you like better), I suggest you call him and say you’ll come there, if he matches the $8/day price of the first place.
Keep in mind prices quoted are in northern pesos. Discount that by about 30% to convert to real money.
Let me add that I know nothing about either of these places, apart from what I gleaned online and in a short phone call with Chuck. I have no financial interest in either and am not working on commission for either.javascript:emoticon('

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Also, I could probably find one or two people in C. River who would let you use their driveway for a short stay, no charge if I asked, but they could not be expected to offer the most secure storage, nor to act as insurers. They would be liable to the extent of ordinary bailees without reward.