The Haines 31's (amongst many others) have the same lack of access from the bow to the bank, which I initially thought was going to hinder moorings, however I've discovered that as long as you take the boat into the mooring slowly at 45 degrees to the bank (going upstream if there's a current), you can easily swing the stern around to bring the boat alongside the mooring. So as long as you take it slowly and calmly it should be ok, the majority of problems I've seen people having with mooring is when they've tried to do it too fast.
The Sonata is a great looking boat, but the inside does look a little cramped. As you're going in July though, the weather should be nice, so you'll probably be spending most of the day outside, so I wouldnt worry about it.
Pete