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Since our main vacation time is normally from the end of July to the end of August we seldom spend time in the San Juans - just too crowded with motor boats, mostly the Tuperwear type, and not much wind. If you can get there sooner before the peak season perhaps the infestation would be less. Higher fuel prices might help too since many come up from Tacoma and Olympia, maybe they will run out of money first (wishful thinking).With regard to the two places you mentioned, the only experience I have is just in passing, literally. Griffin Bay is far enough from the straight line between Cattle Pass and Turn Island to help minimize wake. Also, the route de jour for motorboaters is the canal past La Conner with a fuel stop in Anacortes (the highest prices for fuel in the area are at Friday Harbor - and they brag about it!!), and thence past Decatur Island. There is a caution for pilings in this area but probably close to the shore.Spencer spit park is another place we have only been past - and unfortunately, the main traveled way is fairly close to the mooring buoys and the best anchorage area. If it gets too rolly consider moving to the south side of the spit where the wakes should be less, especially if you can tuck in behind Frost Island. The places we used to enjoy were Garrison Bay (used to be frequented by sailboaters who wanted to avoid Roach Hbr) see the fort tower at English Camp, Stuart Island Prevost Hbr (watch out for the large rock on the north west side of Satellite Island), and Sucia. The last time we were in Prevost Bay there were a number of PWCs but these may be banned now, and people using their loud hailers and horns for communication. Doesn't make you want to hurry back.August is actually a good time to 'do' south sound as the place is practically deserted.Smith Island: We've encountered tall waves just north and east of Smith Island. These occur during the ebb and are caused by the southbound ebb from around the east side of the San Juans meeting the northbound ebb past Port Townsend. The waves are very tall (5 ft?) and close together (10ft?)and not fun to be in.Pt Wilson: On the north west side of the point is a shallow area where during the ebb the flow is eastward. The eastward current colides with the northbound ebb and also causes a lot of turbulence. This is not normally much of a problem because one probably doesn't want to be in this area anyway, at least not for a crossing, but the turbulence can be a problem if you're on the west side of the channel near where it shoals. Port Townsend Anchoring: If you anchor out recommend a plow anchor and in water deeper than kelp. The kelp grows really thick here, especially east of the ferry terminal, and I've seen a number of boats drag anchor because their anchors got clogged with kelp. We usually anchor in the area west of the ferry terminal and even south of the Port Townsend marina entrance. There are usually a few boats anchored just south east of Pt Wilson and the advantage here is one can actually see the entrance conditions to decide if it's a good time to go.Hope the above helps and have a good trip!