Which Should You Visit?
Both islands demand a commitment—Block Island requires a ferry from mainland Rhode Island, while Sanibel connects via causeway from Fort Myers. The decision hinges on what kind of coastal escape you need. Block Island delivers weathered Atlantic drama: steep clay bluffs, rolling surf, and the compressed energy of a 7-square-mile landmass where bicycles rule narrow roads between Victorian hotels and wild beaches. Sanibel spreads across 15 miles of Gulf Coast calm, where warm shallow waters meet shell-dense sand and manatees drift through mangrove channels. Block Island operates on seasonal intensity—peak summer crowds, then near-abandonment by October. Sanibel maintains steady subtropical rhythms year-round, with snowbird migrations rather than total shutdowns. The choice splits between New England's maritime austerity and Florida's tropical ease.
| Block Island | Sanibel Island | |
|---|---|---|
| Water Temperature | Atlantic waters peak at 70°F in August, refreshing but brief swimming season. | Gulf waters stay above 75°F from May through October, winter lows around 65°F. |
| Transportation Access | Ferry-only access creates genuine island isolation but limits luggage and scheduling. | Causeway connection allows normal car travel but reduces the island feeling. |
| Terrain Variety | Dramatic elevation changes with ocean bluffs, freshwater ponds, and rolling hills. | Flat coastal plain throughout, with beaches, mangroves, and minimal elevation. |
| Seasonal Operations | Many businesses close October through April, creating ghost town atmosphere. | Year-round operations with peak season December through April. |
| Beach Activities | Surfing, ocean swimming, and dramatic photography from clifftop positions. | Shelling, warm water swimming, kayaking through mangrove tunnels. |
| Vibe | ferry-accessed isolationAtlantic cliff dramabicycle-scale explorationseasonal intensity | shell-collecting beachesmangrove wildlifeGulf Coast warmthyear-round accessibility |
Water Temperature
Block Island
Atlantic waters peak at 70°F in August, refreshing but brief swimming season.
Sanibel Island
Gulf waters stay above 75°F from May through October, winter lows around 65°F.
Transportation Access
Block Island
Ferry-only access creates genuine island isolation but limits luggage and scheduling.
Sanibel Island
Causeway connection allows normal car travel but reduces the island feeling.
Terrain Variety
Block Island
Dramatic elevation changes with ocean bluffs, freshwater ponds, and rolling hills.
Sanibel Island
Flat coastal plain throughout, with beaches, mangroves, and minimal elevation.
Seasonal Operations
Block Island
Many businesses close October through April, creating ghost town atmosphere.
Sanibel Island
Year-round operations with peak season December through April.
Beach Activities
Block Island
Surfing, ocean swimming, and dramatic photography from clifftop positions.
Sanibel Island
Shelling, warm water swimming, kayaking through mangrove tunnels.
Vibe
Block Island
Sanibel Island
Rhode Island, USA
Florida, USA
Sanibel's calm, warm Gulf waters and gradual slopes beat Block Island's cooler Atlantic surf and rockier entries.
Block Island works entirely by bicycle or on foot, while Sanibel's 15-mile length makes bikes practical but cars more convenient.
Block Island's ferry access and limited supply drive higher accommodation costs, especially in summer peak season.
Block Island peaks June through September, while Sanibel's optimal months are November through April.
Sanibel excels with manatees, dolphins, and diverse bird species in mangroves; Block Island has seabirds and harbor seals.
If you love both ferry-accessed Block Island and causeway-connected Sanibel, consider Martha's Vineyard or Anna Maria Island for similar island scales with distinct coastal personalities.