Assemble at the campus meeting point and book 1–2 shared Ubers/Rapidos (split fares among 4–6 people) to Lulu Mall; leaving at 10:00 keeps traffic manageable and gives you a full day in the city.
Lulu Mall (large shopping & entertainment complex) is great for window-shopping, the food court, and indoor hangouts; mall hours typically 10:00–22:00 so you can comfortably explore on arrival.
Stroll stores, check the food court for budget lunch options and use the mall as a weather-proof stop; if interested, play arcade games or catch a quick movie (check showtimes); food court vendors usually open from ~11:00 but some counters open by 10:30–11:00.
Take a cab/auto from Lulu Mall toward MG Road / Cubbon Park area (central hub for parks, shopping and eateries); typical ride ~25–40 minutes depending on traffic.
Enjoy a filling, budget-friendly lunch at a popular local spot or cafe on Church/Brigade Road — many places serve South Indian, Andhra and biryani options at pocket-friendly prices; most eateries open 11:00–23:00.
Stroll the shaded avenues and lawns of Cubbon Park (open 06:00–19:00) and take photos of nearby Vidhana Soudha from the outside; a green respite in the city center that's free to enter.
Head to lively Commercial Street for inexpensive clothes, accessories and street-food snacks; most shops are open 10:00–21:00, making this an ideal spot for quick, affordable shopping.
Take a short break at a café on Church Street (or a classic place like Koshy's if you want atmosphere) for tea/coffee and a light snack; cafes here are open throughout the afternoon and are great for regrouping.
Walk past Brigade Road for some city vibe photos and window-shopping; you said to avoid dining at UB City, so treat it as a photo/people-watching stop only (UB City external areas open during mall hours).
Have an early, hearty dinner at a budget-friendly Andhra or South Indian restaurant on or near Brigade Road; portions are generous and will stretch your budget — plan to finish early to avoid peak return traffic.