The Appalachian Mountain Club’s Narragansett Chapter hosts two clam cake rides this weekend.

The Providence Journal / Tom Meade

Paddlers and pedalers are celebrating the arrival of summer with guided kayak and bike trips organized by Rhode Island conservation groups.

Blackstone Valley

The Blackstone River Valley National Heritage Corridor Commission and the Blackstone Valley Tourism Council will host the annual Rivers Day Celebration Saturday at the Central Falls Boat Landing, 45 Madeira Ave. There’ll be food, and special events for children, as well as National Park Service Rangers giving special guided river boat tours. The celebration runs from 10 a.m. to 4 p.m. Call (401) 724-2200 for more info.

The Blackstone River Bikeway Patrol offers guided tours this summer on Thursday evenings and Sunday mornings. Take a Father’s Day ride, explore Valley Falls, or experience the Recycle Cycle. Visit their Web site for a full schedule: blackstonebikewaypatrol.org.

Explore the Blackstone River aboard the riverboat Explorer that departs from Central Falls Landing (45 Madeira Ave.) every Sunday through Oct. 11 at 1, 2, 3 and 4 p.m. Tickets are $10; $8 for seniors and children. Saturday, travel the river aboard Explorer from noon to 4 p.m. The boat leaves the Central Falls Landing on the hour.

Pawtuxet Cove

Save The Bay will hold a saltwater paddle around Pawtuxet Cove and upper Narragansett Bay Saturday from 9 a.m. to noon. Paddlers may use their own canoes or kayaks; rentals available for $5. Canoes and kayaks must adhere to safety requirements outlined at www.savebay.org. Tickets cost $25, or $20 for members of Save The Bay. Reservations required. Call Save The Bay at 272-3540 ext. 103, or email guide Rob Hancock at rhancock@savebay.org.

Southern RI

The Wood-Pawcatuck Watershed Association (WPWA) continues its Source to Sea trips on the Pawcatuck River Sunday. The 54-mile paddle, over four weekends, began June 6. The trip will go from Richmond to Potter Hill Mill in Hopkinton. Preregistration required. Participants must have experience paddling on moving rivers, and must provide their own boats and wear life jackets. Everyone will meet at 9 a.m. at the put-in sites. A donation of $15 ($10 for members of participating groups) for each day is requested. Proceeds will benefit programs that protect the rivers. For more info, or to register, call WPWA at (401) 539-9017 or email denisep@wpwa.org.

On Sunday, from 12 to 4 p.m., WPWA will be at the Historic Kenyon Grist Mill in Usquepaug for Kenyon’s open house. Paddlers will take short tours around Usquepaug Pond. The event is free.

The Appalachian Mountain Club’s Narragansett Chapter has scheduled two clam cake rides for Saturday. The group will lead an Easy Rider Clam Cake Ride along the South County Bike Path to Aunt Carrie’s, and then to the beach, with an ice cream break. The trip is 25 miles at 10 to 12 mph, an easy pace. Helmets are required.

For the starting time and meeting place, contact either of the leaders: Michael Krabach at (401) 333-5350 or mkrabach@cox.net), or Linda Pease at (401) 351-2234.

There’ll be a tougher Clam Cake Ride –– an intermediate paced 37-mile social ride –– along the beaches to Point Judith Lighthouse with a stop for clam cakes. For starting time and meeting place, contact leader Barbara Flagg at (401) 487-4376 or at bakayaker51@verizon.net.

tmeade@projo.com