I did a little pre-scouting and here is what I found out.
Minor bad news; Gone are the days of the $2 all day metro rail pass.

Each ride on the metro rail will now cost $1.25. Each ticket has to be purchased at a kiosk at the rail station before bording. I can envision problems with half a dozen of us trying to feed dollar bills into the rail ticket kiosks while managing gear etc as the train is coming. Metro offers a prepaid, RFID enabled card at many grocery stores.
Here is a PDF listing that you can search for places in your zip to buy said card. I would guess that four or five trips would cover the day. ($5 or $6.25)
Market Square
Plenty of old archetucture to photograph.
Plenty places to eat. Les Girivals (vietnamese) (across Congress Ave. from Mkt Square) looked pretty good.
Market Square parking
Kim-Son parking garage
-Found the restraunt closed (bummer) but the gerage is open.
Weekend entrance on Milam between Congress and Preston.
$5 all day. Attendant was there when I parked and left.
Right on Market Square.
Hermann Park
Plenty to shoot as always.
We might want to start in Hermann park to beat the crowd. I arrived about 1:30 and had minor difficulty waiting for people to clear a scene.
Hermann Park Parking
Park in park for free if you are early or lucky.
-or-
Park Plaza medical center - parking garage
5700 n caroline
North of Science meuseum & right next to metro rail station.
$10/day
Rice Univ.
Still have not had any responce frim Rice about photography on campus. Stopped by any way. Got some nice shots w monopod and 35mm. Passing security did not even take note of my activty. As a matter of fact did not notice that I was trying to flag him down as he was riding off on his bike. I will stop by Rice business offices this week to enquire.
DANCING FOUNTAINS
lots of lighting in fountain - could be good for dusk evening shoot.
Actually called "Gus S & Linda F Wrotham park"
corner of main & Holcomb
Wind blowing thru park can cause lots of spray. Bring rain cover for gear if you are highly concerned about your gear getting wet.
No public parking in immediate area