Love's Marina
Take the Beltway (from Pearland) across I-10 and keep going North. You want to take OLD BEAUMONT HWY 90 East. Once you get on OLD 90..there is a new right before it BTW....heading East, you will go through 4 or 5 lights. Keep going. Cross over a bridge (San Jacinto River) and take the first right after the bridge. The road will take you back West basically under neat the 90 freeway. Anyway follow it down and the Marina will be on your right. Once you get in, use the ramp to the left..the one on the right can be a pain when the tide is out. That should get you there.
There are nice places on the river to play. My favorite is to head North to Newport Beach. once at Love's you would head right up the river under the train tressel. BE AWARE THAT YOU HAVE TO SWING WAY OVER TO YOUR LEFT TO CROSS UNDER THE BRIDGE LIKE THE FOURTH OPENING BETWEEN POLES THE LEFT OF THE BANK. There is a sand bar that has silted in the big opening. Stay in the middle of the river for the most part and you'll be ok. Anyway..heading north up the river, you will go through one long no wake zone, but once past that you can plane off and keep going. Directly you will come to a pretty hard right in the river...keep going. The beach will be a 1/4-1/2 mile further up the river on your right hand side. Nice beach with a long run out of shallow to deep. Good for the kids to swim.
Hope this helps
Dale