Stroll the historic botanical garden to see the glasshouse, Lalbagh rock and mature trees — excellent for photos and a relaxing walk; Lalbagh is typically open 6:00–19:00.
Book a cab/auto from Lalbagh to LuLu Mall; using a shared ride keeps per-person cost low while you move to the mall for lunch and shopping (estimate travel ~30–45 minutes depending on traffic).
LuLu Mall (mall hours typically 10:00–22:00) is great for shopping, a large food court, quick entertainment (arcade/cinema/activities), and group-friendly browsing.
Eat at the mall food court or a budget-friendly restaurant inside the mall — you’ll find South Indian, North Indian, biryani and quick-service chains that are filling and economical for groups.
Browse shops, check out the mall's entertainment options (arcade, indoor activities or window-shopping) and pick up souvenirs or small gifts — mall stores generally open from 10:00–22:00 so you have ample time.
Finish the day with an early, budget-friendly meal near campus (local South Indian tiffin centre or multi-cuisine casual spot) — avoids dining at UB City as requested and keeps costs low.