Free things to do in Andalucia: the Sherry triangle of Cadiz, Jerez, El Puerto de Santa Maria, Sanlucar de Barrameda, Chiclana de la Frontera

El Puerto de Santa Maria - updated opening times here

- Real Plaza de Toros free entry to the bullring
- Basílica Menor Ntra. Sra. de los Milagros (Iglesia Mayor Prioral) Free entry on Saturdays and Sundays, 1 euro other days

- Monasterio de la Victoria Open on Fridays and free
- Museo Municipal - Palacio de Candia free
- Casa Palacio de Aranibar free (where there's the tourist office)

- Castillo de San Marcos - free on the first Tuesday in the month, but you have to book according to the instructions on this page. If not it costs 10 euros

Cádiz

- Castillo San Sebastian free entry to the castle (being restored and closed September 2018)
- Roman theatre free entry, not much left but interesting interpretation centre and video

- Castillo Santa Catalina free entry, interesting to walk around the castle, views over La Caleta, exhibition rooms with art etc

- Iglesia de Santa Cruz (Old cathedral) free entry

- Parque Genovés, free entry, botanical garden, explanations of some of the most interesting plants

- Walk all around old Cadiz along the sea walls and promenade, Paseo Marittimo

- Follow the different coloured tourist routes marked in colours on the roads and pavements  and get the free map from the tourist office to know which route you're doing.

Jerez
- Santo Domingo cloisters, free for a stroll around, also hosts exhibitions.
- Mercado de Asbastos is excellent and it's also nice to stroll around the centre.
- Visit the Tabancos for sherry and Flamenco, you can get a route of the Tabancos at the tourist office.

Sanlucar de Barrameda
- Museo Manzanilla Barbadillo

The visit to the Museum on the first floor, which is interesting with a good explanation of the Solero method of wine-making, is free. Guided tours and tastings are also available.
- Palacio Municipal

In neomudejar style the 'town hall' can be visited free from the outside together with the gardens behind Jardines históricos del Palacio Orleans-Borbón Mon - Fri from 8.30 a.m. to 1.30 p.m. After they shut the gates and there are high walls all around so you can't see anything
- Parroquia de Ntra. Sra. de la O, open for mass
- Las Covachas, Gothic style arcade on the road up to Barrio Alto, near Mercado de Abastos
- Mercado de Abastos
- Plaza de Toros is open 10 - 13 and is free, you can just go in and wander around. We watched some young men practising.
- Palacio Ducal de Medina Sidonia, currently a hotel, guided visits cost 5 euros but you can go into the cafeteria and admire/sit in the patio and rooms of antique furniture for the price of a coffee 

Chiclana de la Frontera

- Centro de Interpretacion del Vino y la sal
Very detailed, modern and well set out, with lots of information and even the opportunity to test your nose by sniffing smells in a bottle
- Mercado de Abastos, an excellent and modern air-conditioned market with bars and places to eat round the back.
- Museo de Chiclana - free with lots of different sections dedicated to local history. We just had a quick look but could be useful on a rainy day

Free things to do in Andalucia: Jaen, Cordoba HERE

Free things to do in Andalucia: Malaga, Ronda, Antequera HERE