If you can get by on $40 a day on cabs more power to you, but a round trip even within downtown is usually $20 alone. Going to Sea World is at least $20 each way.
Nothing wrong with catching a trolley here and there despite what some are saying.
You could take the Coaster a few places too...
Hash House is amazing.
Broken Yolk is 2nd.
Breakfast Burritos from p much any Mexican joint are essential.
Just read your thread here, I would def take trolley to places. You should hit up Old Town too.