The town’s lakes, parks, and events create plenty of opportunities for outdoor activities.Downtown Leesburg, Florida.Credit: Michael Warren/Getty ImagesAmerican retirees spent an average of $5,100 per month in 2024, according to Federal Reserve data. If your budget is lower than that, take heart: GoBankingRates recently published a report on the best small, fast-growing cities where senior adults can live well on half that amount.The ranking is …