For a lifetime memory, paddle in the spring when the cherry blossoms explode in gauzy pink bloom. Upriver from Roose­velt Island, civilization abruptly disappears and serenity reigns.

Outfitters: Thompson Boat Center, (202) 333-9543, www.thompsonboatcenter.com; Jack’s Boathouse, (202) 337-9642, www.jacksboathouse.com

.


.