The run up from Vancouver is pretty exposed and lacking in shelter for smaller boats, the first decent refuge after Gibsons is Secret Cove. Although the ferry is a cost and can be a hassle, it's less risky in terms of weather and sea conditions. Launching in Secret, Pender or Egmont is a safer, more predictable plan especially if you're limited to specific dates due to work and school commitments.
The run up Jervis to Louisa can be either fast and glassy, or choppy all the way if outflow winds are blowing - early morning start from Egmont usually gets you up the inlet before the blow.
In midsummer the inlet sees lots of cruising boats, but the campsite at Chatterbox is often empty. More of a challenge is getting dock space, but small boats need less of it, and they can scoot into a space by arriving outside the "commuter hour" traffic pattern driven by the tides at Malibu Rapids. The bigger boats need to transit these during slack tides, whereas small fast boats can safely pass through in most tide conditions, bypassing the waiting cruising boats.
The best trip we ever had to Princess Louisa was in a period of midsummer cool, damp days. Rain was sporadic, but over a few days it was enough to get some of the little waterfalls going around the inlet. Wind was zero, like a mirror in there. We had the pick of campsites at Chatterbox so we set up under a massive big leaf maple, and stayed dry for 3 days despite drizzle and showers on and off the whole time. We spent an entire day chugging around the inlet in a 19.5 ft under the canopy, enjoying drinks and appies and those views.
As others have noted, Princess Louisa itself is an RCA, as is just outside the rapids in Jervis proper. But beyond those boundaries there are lings to be had in the underwater debris piles below the towering cliffs. I leave the riggers and accessories at home to save weight/increase range, and to make room for tent and other camping gear, but a couple of jigging rods and a small selection of jigs always seems to make the cut. Downrigger wiring comes in useful to run a small compressor for inflating the air mattress that Mrs Sly insists we bring. I made an adapter for the Scotty receptacle, works like a hot damn.