Suwon: what to see and where to eat
Everything below comes from open data and each row says where it came from. We have not been to any of these places and we do not rank them.
Things to see

Hwaseong Fortress
palace

Everland
theme park in Yongin-si, Gyeonggi-do, South Korea

Isaac Crumm at English Wikipedia / Public domain
Korean Folk Village
living museum

Seoul Grand Park
park in Gyeonggi-do, South Korea

Jocelyndurrey This photo was taken with LG G3 / CC BY-SA 4.0
Ho-Am Art Museum
art museum in Yongin-si, Gyeonggi-do, South Korea

Seoul Land
amusement park in Gwacheon, Seoul, South Korea
Caribbean Bay
water park
Yungneung and Geolleung
Joseon dynasty royal tombs in South Korea

Gwacheon National Science Museum
national museum
Cathedral of Saint John
cathedral in Seongnam

No machine-readable author provided. Hyolee2 assumed (based on copyright claims). / CC BY-SA 2.5
Yongjusa
head temple of the Jogye Order of Korean Buddhism

문화재청 (공공누리 제1유형) / CC BY-SA 4.0
Byeolmangseongji
14th century Korean defensive structure
Places to eat
LAGO
Food: italian
길림성
Food: chinese
대성농장생오리인계점
Food: korean
도이창커피농장
Food: coffee shop
로마경양식
Food: international
메가MGC커피
Food: coffee shop
별나무 카페
Food: coffee shop
상무초밥
Food: japanese
착한설렁탕 본점
Food: korean
Swoyambhu Indian Restaurant
Food: indian
메가MGC커피
Food: coffee shop
모이클래식
Food: pasta
밀실
Food: coffee shop
Bukchon Sonmandoo
Food: korean
Pizza Hut
Food: pizza
동네커피
Food: coffee shop
스타벅스
Food: coffee shop
Opening hours and tickets: OpenStreetMap contributors. Each one shows the day a volunteer last wrote it down, so check the official site before you set out.