Cayo Del Grullo is a saltwater bay forming the northeastern branch of the larger Baffin Bay system on the Texas Gulf Coast, located near Riviera. It is a shallow, open bay characterized by a mix of sand, mud, and rock bottoms, with notable submerged rock structures that can be hazardous. The primary public access for paddlers is a boat ramp on FM 1140 near Riviera Beach, which provides parking and direct bay access. This bay is part of a complex tidal system influenced by the Laguna Madre and Gulf of Mexico, with water levels fluctuating significantly; there are reports of periods where tidal ranges are so minimal that boat ramps can become unusable due to a lack of water. Paddlers must be prepared for these conditions and plan around tidal stages. The bay is noted for its high salinity and nutrient-rich waters. The surrounding shoreline is largely undeveloped, with views of the King Ranch lands offering potential wildlife sightings. The paddling experience is generally considered calm and suitable for beginners in protected areas, but the open bay can be exposed to wind, and the connection to Baffin Bay proper requires ocean fishing experience and is not recommended for novice kayakers without a guide. Hazards include submerged and sometimes visible rock piles, particularly near points and shorelines, which pose a risk of impact. The best times for paddling are spring, summer, and fall, with morning hours typically offering the calmest conditions.