Just throwing this out there -
First of all, Saltwater is a great site. The artificial reef and rubble fields provide tons of structure and attract a lot of life.
Unfortunately, it is also very exposed to current and it has a long swim to get to the reef. Combined, those two factors make the site pretty current sensitive to dive. Once on the reef, the structure can protect you from the current, but getting there and back can be a long and difficult swim.
Saturday has pretty large exchanges, with hardly any slack. Not an optimal day for this site.
Many years ago, this was the site that taught me how important it is to check and understand the current tables when diving here in the sound. Our dive shop scheduled group dive there on Saturday. The plan was to meet around 10am, gear up, and splash at 11am. My buddy and I were full of newbie enthusiasm, and decided to show up early, when the park gates opened, and get in a dive before everyone else showed up.
We had our butts absolutely handed to us by the current. Running low on air, we did our safety stop and ascended, surfacing nearer to the reef than the shore. The surface swim in the current back to shore took more than 15 minutes of constant finning (not an exaggeration, I checked). We were exhausted by the time we got in.
Encouraged by the rest of the group, we hesitantly agreed to join the planned dive (the newbie enthusiasm helped). That dive was fantastic. Timing the slack made all the difference.
I learned how to read current tables later that day.
Personally, I'd dive elsewhere on Saturday and save Saltwater for a day with more favorable tides. Go ahead a buy an annual discovery pass. You'll be back.