Motorized bikes are not allowed on the beach bike-running-walking paths.

Not sure there is such a shop. Have never seen a vehicle hauling bikes or anything like it

About 2 mi or 15min to the Venice Pier about 3 miles to the Marina Del Rey jetty which is the south end of Venice

I don’t think you will have any problems rollerblading the path. Some of the sharper bends have a bit more sand on the path than other sections. The path can get quite congested during busy times as walkers, cyclists, scooter rides and rollerbladers all share the path in most sections.

a little further north at surfrider beach malibu...right next to the pier

Further to your query there are periodic signs and you can start on it anywhere. It runs along the beach except for about a mile where it goes inland for about a 1/4 mile just south of Washington Blvd. If you’re going to be staying in Marina del Rey I would go to Washington Blvd near the beach. There are a number of bike rental places that will also provide you with a helmet (which is required). If you have a choice take it during the week as it will be less crowded. Bike North through Venice and into Santa Monica if you want the sights and sounds of Southern California. If you want a quieter ride with less people and attractions then ride South.

It depends on the vendor as far as locks go. Some do, Some Don't. Even with a lock I wouldn't part with it in some of the beach communities due to the homeless and the thugs that tend to look for opportunity. I'd say use the bike path, simply for that. Take the bike indoors to the places that will allow them.

You ride there and back (we bring our own bikes and hitch them to the car.). There’s no one way bike rental available, to my knowledge, on this path — but you can rent s bike and ride it back to the rd gal place in Santa Monica.