The attached pics show just how nice it can be. We got very lucky. That was in early May of this year. You will want conditions like this with boats under 30 ft.
Conditions are probably best in summer. An early morning crossing is a good time before daytime heating starts kicking the winds up. Light winds out of the south will give you conditions like shown here. North winds fight the gulf stream and things get messy.
Once at Bimini boating on the Great Bahama Bank is beautiful. ( pic 4 ) There are also some neighboring islands you can visit.
Here is a link to Bimini Bay Resort: http://www.biminibayresort.com/