im just going to agree with what most are saying...
bainbridge- great to get deep, vis is ok (about 10 feet) above 95 feet and about 42-44 degrees all the way down.
willow springs- shallow, very laid back, lots of stuff to see, ropes if you are not great with navigation.
dutch springs- ive only been there one weekend, they are really strict and have a long list of do's and don'ts that they enforce, and if your not a pass holder and plan to camp out sat night they make you pay for sunday diving up front and have to leave by 9 am sunday if you want your money back, also very crowded and a long walk from the parking lot , but the vis is great and it is deep enough and a good amount of stuff to see. more than what is on the map.
as for a suit... if you plan on going deep then i would suggest a dry, semi dry, or a at least a 7mil. even if the surface is 70 in the summer, when you get down to 90 feet it gets pretty cold in a 3 mil.
hope my 2 psi is helpful.