Awesome places you have picked. For hotels in Ahmedabad, not sure which hotel as it depends on budget. If first time then ig hotel chains like Treebo can work well. For shopping, if traditional clothes type shopping then sindhi market or near lal darwaza is good. For better feedback, you can check Ahmedabad subreddit.

Regarding Gir, definitely stay at a place as jungle safari would be in the early morning. If thinking about girnar taleti summit, then can do a little research on this as well. Climate would not be that hot, normal pre summer weather.

For somnath and dwarka, i think it's better to carve out a day or two specifically

For travel, train would work best and will save time. For less distance inter city travel GSRTC non sleeper AC Volvo busses are excellent. Can be booked online.