At Otter Bar Lodge's all-inclusive whitewater SUP school in California, beginner paddlers move from flat-water ponds to Class III whitewater in a week. Up to 14 guests stay in the western-style lodge along a Class II section of the Cal-Salmon, one of six rivers within an hour's drive of the resort. Go in August, when the daytime temperatures rise into the mid-90s. ($1,990 all-inclusive; otterbarlodge.blogspot.com).
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