Enterprise is right at 61st & I45/Broaday. Not far from the terminal, but...
Bike week is a traffic nightmare. I would budget more than an hour to get the 30 blocks. Try & arrange the cab to be at the Enterprise at a certain time?
What day/time is the departure?
Are you driving in that day?
PS- bike week or The Lone Star Rally, is lots of fun & brings a diverse crowd to the island, but we take our bicycles everywhere for the really busy days & stock up on all groceries, drinks & whatever else well before hand.
PPS-Last year it had 500,000 attendees. It used to take over the whole island, but the last few years has been concentrated downtown.
PPPS-The cruise terminal is downtown.