An AI overview of the umpteen "top 5-10-20-pick-a-number things to do in Valencia" websites listed these >>>>>
Architectural and historical sites:-
City of Arts and Sciences: A futuristic complex with an aquarium, science museum, opera house, and IMAX cinema.
Valencia Cathedral: Features a mix of architectural styles and is home to the Holy Chalice. Climb the octagonal Miguelete tower for panoramic views.
La Lonja de la Seda (Silk Exchange): A UNESCO World Heritage site and a stunning example of Gothic architecture.
Valencia Central Market: A bustling market with fresh produce, seafood, and local goods.
Mercado Colón: A historic market that now houses many restaurants and bars.
Torres de Serranos: One of the old city gates.
St. Nicholas Church: Known as the "Sistine Chapel of Valencia" for its Baroque decorations.
Parks and nature>>
Turia Gardens: A unique park created from the old riverbed, perfect for walking, biking, and sports.
Albufera Natural Park: Located just outside the city, this natural area is known for its tranquil waters, bird watching, and being the birthplace of paella.
Malvarrosa Beach: A wide city beach with a promenade full of restaurants and cafes.
Museums and neighborhoods>>>
Museum of Fine Arts: Houses a collection of fine arts (thx 'AI', good to know there's an expert around?!!).
Bioparc Valencia: A zoo that uses "zoo-immersion" to create a naturalistic environment for its animals.
Barrio del Carmen: A bohemian neighborhood with medieval architecture, art galleries, and lively bars.
Rosafa neighborhood: A trendy area known for its bustling atmosphere, shops, and restaurants.
Hortensia Herrero Art Center: A new art center housed in a historic building.
Centre del Carme Cultura Contemporània: A former convent now used for modern and contemporary art exhibitions.
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Hope that helps!! (for real atmosphere, & likely some good value food, seek out the old market!)