Since you arrived in Thiruvananthapuram around 3:00 PM, head straight to Kovalam Beach by taxi or auto-rickshaw; the drive usually takes 25–40 minutes depending on traffic. Start with an easy walk along the shore and the quieter stretches around Hawa Beach, watching the fishing boats and sunset over the Arabian Sea. August can bring clouds or a brief shower, so carry a light rain layer and avoid swimming if the red flags are out. Keep valuables with you rather than leaving them on the sand.
Continue to Vizhinjam Marine Aquarium, roughly 10 minutes from the beach. It is a small, practical stop rather than a major aquarium, and its usual closing time is around 5:30–6:00 PM, so treat this as a “if still open” visit and confirm locally before making the short trip; entry is generally inexpensive, around ₹20–₹50. Then return toward Lighthouse Beach to admire the distinctive red-and-white lighthouse and the coastal viewpoint. The lighthouse climb may close by early evening or be restricted during rain, but the outside viewpoint is still worthwhile. Auto-rickshaws are convenient for these short hops; agree on the fare first, usually about ₹100–₹200.
Have dinner at The German Bakery near Lighthouse Beach, a relaxed spot for seafood, Kerala dishes, sandwiches, pasta, or café fare. Allow roughly ₹400–₹800 per person, and expect service to be casual rather than quick—ideal after the beach. Try a local seafood preparation or a Kerala-style meal if available, and check whether card payment and kitchen service are operating normally before settling in.
After dinner, return to Thiruvananthapuram by taxi or app cab via the Kovalam–Thiruvananthapuram road. The drive is normally 30–45 minutes, but evening traffic and monsoon showers can add time; book the return ride before leaving the restaurant, as availability is thinner around Lighthouse Beach late at night. If you are staying in the city, this is a good point to end the day rather than add another attraction.