Any bike experts?

[sanantone]

I'm on a budget, so I'm looking at bikes at Walmart in the $100-120 range. I plan to mostly ride on a trail that's partially paved and partially a flat, wooden boardwalk kind of thing. However, I think I might want a bicycle that can ride on a wider variety of surfaces just in case I have to move away from that trail and have to ride on dirt trailers. I was looking at a cruiser, and I know cruisers are only good for flat surfaces. They are also slow, but that's not a major concern of mine. I'm also looking at a mountain bike, but I'm not sure how comfortable it's going to be for long rides. I plan to attach a trailer too so that I can tow my dog. My other concern is that someone complained about the mountain bike frame not being big enough for someone who is over 5'8". I'm 5'9" with long legs. Which one do you think will be better?

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