I'm not bringing a bicycle.

How do I get a ticket for a party boat on Lake Travis? I can only find places where I can rent an entire boat?
I'm going with a buddy so it would be much more fun to join a bunch of others on a large boat.

Barton Springs is supposed to be pretty awesome so we will go there. For nightlight, we will hit up Congress, and
W 6th.

Any other recommendations?