Last year for a July trip I brought a shorty and wore it once...the preferred outfit was shorts, light thermal, drytop, UV long-sleeve shirt, PFD. Having the long-sleeve shirt over the drytop both protects from sun damage and keeps you cool (roll to get it wet!). Also, that UV shirt gets washed all day-every-day, so it works great for some sun protection on side hikes without getting stinky.
It probably doesn't need to be said, but bring a long, fast, comfortable boat.
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