One day in Colombo on a layover is it worth going up the Lotus Tower

The Lotus Tower is the tallest self-supported structure in South Asia and the foreigner ticket runs around 20 USD for the observation deck; the city-and-ocean view is good, best near sunset. For one relaxed day: morning at the Gangaramaya Temple and a stroll around Beira Lake, lunch of crab or rice and curry, afternoon wander through the Pettah markets or the colonial-era Fort district, then Galle Face Green at sunset for street food (isso wade, kottu) by the sea. Cap it with the tower at dusk if time allows.