It depends on which dock the Victory will be at, there are two docks in San Juan. If you dock at the new Pan American pier, you would need to take a taxi. If you are docked at the pier in Old San Juan, then you could walk. Senor Frogs is on the street in back of the Sheraton Old San Juan, across from that older pier.
Yes if your at the pier by Old San Juan just walk. I just went in December it was fun, rowdy, with a good rock cover band, a Spring break meets girls gone wild experiance (bootie shaking contest)
Walk around Old San Juan if you have time in the day take a taxi to Fort Christabelle, very beautiful views of the island lots of photo ops! Skip the ship's city tour I did it and we only got 20 minutes at the fort my friends took a cab and spent 3 hours roaming around.