On a budget, weigh it — The 606 (Bloomingdale Trail) isn't cheap for what it is.
Free
A pleasant, leafy elevated path that strings together hip neighborhoods and gives a local's-eye view of the city — great for a run or a stroll. The honest catch is that it's lower-key than NYC's High Line: less designed spectacle, more functional greenway, so come for the neighborhood vibe rather than a headline attraction.