Try for rann of kutch depends if you are going around Jan Feb march then only
Adalaj ni vaav
Siddi saiyed jali
Kankaria lake
If you are a foodie go for manek baag it's open 24 hours - try the dosa it's a speciality Municipal market of cg road
In baroda you can visit sindh road, rasalpur, mahi river and laxmi villas palace...
Lal darwajaa in Ahmedabad for shopping
Law garden for eatery and shopping
You can travel Rann of Kutch, Kalo Dungar. Explore places in Bhuj you have museums, bhuj hill and bhujodi market for shopping. Mandvi is a place for beach and vijay vilas palace. If you have time explore Ahmedabad also.
Well it is not in Gujarat but Diu is always an option. It is an off beat beach location with cheap prices and just to chill. You can also find water sports there after navratri