Not required for this place. It's pretty small, well maintained and has self explainatory boards. It has a museum with a introductory video as well. Only a vast place like dholavira would need a guide.

Hi Shridevi, Lothal site has two parts: the excavated relics and the museum. Spend about an hour at the museum, and an hour outside. Velavadar Wet and dry sactuary is not very far. I suggest you stay there the night earlier. In the evening visit the dry-land sanctuary of blackbucks. Early morning, take a guided tour to the wetland part of the sanctuary, you may find some birds. Then head to Lothal. Alternatively, if you are coming onward from some place, visit Lothal first, then head to Velavadar. On my visits, I have driven past Valbhipur as well, but have not stopped to visit: they say it is interesting, too. I hope it helps.

I have not been to Dholavira, (I have been meaning to) but based on what I hear, you should visit both. That brings in the constraint of time and your flexibility to travel from where you will be landing. If you are going to be in Ahmedabad, Lothal is close and will take one day if you want to spend time on site. Not very far away from there, there is Velavadar sanctuary with wet and dry land and facility to stay. Bring your vehicle. If you have time to travel to Dholavira, and your own vehicle to go straight from Ahmedabad, you have to leave a day earlier because it takes more than 6 hours to reach.

The best way is to travel by car and on the way you can see some more places. As there is a fixed time to visit this place, please check with the time to enter the site from their website. And Friday the site is closed. More details can be obtained from their website.

The site - apart from the museum is open. So it can get very hot - which I presume is the weather post monsoons. If you are prepared for the weather, I do not see a problem.

Brother, there is a lot to visit in Ahmedabad specially the old city. For someone passionate about the history and very knowledgeable about the city and nearabouts, I would suggest you contact Mr. Haseeb Sheikh in Ahmedabad. He has extensive knowledge about Gujarat and would love to guide you around. I have had the pleasure of been taken around Lothal, Patan, Ahmedabad, Vadodara and Champaner by him.

GSRTC buses drop you nearby.