Is there a decent boat ramp in Sandwich with parking? Or any ramps just over the bridge with trailer parking?

Sandwich Town Marina, Has a good boat ramp, wide and steep. Parking like anything else on the cape can be crowed.

Get there early and you'll be all set. It's a dual ramp which is great, staffed well to keep the peace and operate smoothly once it gets crowded.

Sandwich Town Marina is the best. Launched there this morning. Great ramp. Parking can get limited sometimes. Get there early.