Morning 0430h to 1100h & Evening 1700h to 0830. It is better to go early in the morning to avoid traffic and parking problems

You can have plenty of small and big temples enroute. Most of them are mentioned by others. Still the list I have is shared herewith. THIRUVANANTHAPURAM Andoor Kandan Sree Dharma Sastha Temple, Tholady,Thiruvananthapuram Palakkavu Bhagavathi temple,Edava, Varkala,Thiruvananthapuram Amunthirathu Devi Temple,Mudakkal, Attingal, Thiruvananthapuram Avanavanchery Sri Indilayappan Temple,Avanavanchery, Attingal,Thiruvananthapuram Janardanaswamy Temple,Varkala,Thiruvananthapuram O.T.C. Hanuman Temple, Palayam,Thiruvananthapuram Karikkakom Devi Temple,Karikkakom,Thiruvananthapuram Mithrananthapuram Trimurti Temple,Thiruvananthapuram Mukkolakkal Bhagawathi Temple,Mukkolakkal,Thiruvananthapuram Sree Padmanabhaswamy Temple,Thiruvananthapuram Pazhaya Sreekanteswaram Temple,Sreekanteswaram,Thiruvananthapuram Sarkaradevi Temple,Sarkara, Chirayinkeezhu,Thiruvananthapuram Sivagiri,Varkala,Thiruvananthapuram Mahadeva Temple,Kazhakkuttom,Thiruvananthapuram KOLLAM Ashtamudi Sri Veerabhadra Swami temple,Kollam Changamkulangara Temple‎,Kollam Changanakulangara Devi Temple,Kollam Chengamanadu Mahadeva Temple,Kollam Kollurvila Bharanikavu Bhagavaty Temple‎,Kollam Kottankulangara Devi Temple,Kollam Ammachiveedu Moorthi,Kollam Chathannoor Sree Bhoothanatha Temple,Chathannoor KilimarathukavuTemple,Kadakkal Kottarakkara Sree Mahaganapathi Kshethram,Kottarakara Kottukal cave temple‎,Kollam Mangalathu Mahalakshmi Temple‎,Kollam Meenakshi Temple, Punthalathazham,Kollam Mukhathala,Kollam Oachira ParaBrahma Temple‎,Kollam Palathara Durga devi temple,Kollam Pattazhy Devi Temple,Kollam Poruvazhy Peruviruthy Malanada Temple,Poruvazhy Pulimukham Devi Temple,Thazhava Puttingal Devi Temple, Paravur,Kollam Sasthamcotta Sree Dharma Sastha Temple,Sasthamcotta Sree Indilayappan Temple,Marayikkodu, Karickom Thalavoor Thrikkonnamarkodu Durga Devi Temple‎,Kollam Thirumullavaram temple,Kollam Thrikkadavoor Mahadeva Temple,Kollam Vayalil Thrikkovil Mahavishnu Temple,Ilamkulam, Kalluvathukkal ALAPPUZHA Adichikkavu Sree Durga Devi Kshetram,Pandanad, Chengannur Ambalappuzha Sri Krishna Temple,Ambalapuzha Chakkulathukavu Temple[5],Neerattupuram Chettikulangara Devi Temple,Mavelikkara Evoor Major Sri krishnaswamy temple,Evoor, Kayamkulam Haripad Sree Subrahmanya Swamy temple,Harippad Kandiyoor Sree Mahadeva Temple,Mavelikkara Manakkattu Devi Temple[4],Pallipad, Haripad, Alappuzha Dist Mannarasala Temple,Haripad Mararikulam Mahadeva Temple,Mararikulam, Alappuzha Sree Narayanapuram Thrikkayil Temple,Perissery Vadakkan Koyikkal Devi Temple Puthiyavila,Puthiyavila, Kayamkulam Vethalan Kavu Mahadeva Temple,Kappil East, Krishnapuram, Alappuzha, Kayamkulam Vettikulangara Devi Temple Cheppad,Cheppad, Haripad ERANAKULAM Ammankovil Temple,  Ammankovil Temple, Ammankovil Rd, Shenoys, Ernakulam Anandapuram Shiva Temple Anjumana Temple,  Anjumana, Anchumana Temple Road, Padivattom, Edappally, Ernakulam Arakkal Mahakali Temple,  Ernakulam Balabhadra Temple,  Shree Balabhadra Temple, Pizhala, Ernakulam Devi Temple,  SH 15, Vennala, Edappally, Ernakulam Ernakulam Shiva Temple Ernakulatthappan Temple, Chottanikkara Ettumanoor Shiva Temple, Chottanikkara Ganapathi Temple,  Edapally, Ernakulam Ganpathy Temple,  Muvattupuzha Kaduthuruthy Shiva Temple, Chottanikkara Krishna Swamy Temple,  Palarivattom, Ernakulam Kumbeshwara Temple Kuthappadi Temple, Thammanam, Ernakulam Maradu Bhagwati Temple Paavakkulam Mahadeva Temple, Kaloor, Ernakulam Panangad Ganapati Temple Paramara Temple, Eranakulam North Perandoor Bhagwati Temple Pokkalam Shiva Temple Poneth Temple,  Chelavannur, Ernakulam Poornathrayesa Temple, Chottanikkara Puliyampulli Temple,  Puliyampully Temple, Vypeen Pallippuram Rd, Moothakunnam Puthenkulangara Shiva Temple,  Eswaramangalam Siva Temple, Eeswaramangalam Puthukalavattom Temple,  Elamakkara, Ernakulam Shaktipuram Temple,  Sakthipuram Sri Bhadrakali Temple, Kumbalam, Ernakulam Shastha Temple,  Jawahar Nagar, Kadavanthara, Ernakulam Sita Mandir,  Sri Rama Auditorium, Tripunithura, Ernakulam Sree Krishna Swami Temple,  Aroor Sree Krishna Temple,  Maradu, Ernakulam Sri Sankar Temple,  Sree Sankara Narayana Temple, Devankulangara, Edappally Sudharma Sooryodaya Temple, Konthuruthy, Ernakulam Td Temple,  Thuravoor Temple Road, Thuravoor, Thenali Temple,  Panangad, Ernakulam Vaikkom Mahadeva Temple, Chottanikkara Valanjambalam Temple, Ernakulam Vamanamoorthy Temple, Thrikkakara Vishnu Temple,  Mosque Rd, Maradu, Ernakulam Vyttila Temple, Vyttila, Ernakulam THRISSUR Kodungallur Sri Kurumba Bhagavathi Temple, Thrissur Triprayar Sri Rama Temple, Thrissur Mammiyur Sri Mahadeva Temple, Guruvayur, Thrissur Chowalloor Shiva Temple, Kandanassery, Thrissur Thiruvambadi Sri Krishna Temple, Thrissur Paramekkavu Bhagavathy Temple, Thrissur Vadakkunnathan Temple, Thrissur

there is no restrictions for non hindus as long as you are ready to follow the general rules for all believers. but entering the sanctum enclosure no foreigners are allowed