Your best choice by far is the Delta. You can also tube in that lake by Marine World in Vallejo. I've never fished it, but I called them a year or two ago & they said it's OK (it's a city park across from Marine World - I called the park). There's limited tubing at San Pablo Dam Reservoir. I think you can also tube that lake near Antioch (I've forgotten the name - someone from BNT has tubed it, though). For shore fishing, there's that funky little lake by the Hilltop Mall that actually has bass in it, & there's also Lake Anza in the hills above El Cerrito. Good luck.