Given a travel related situation, and given a specific question about the situation, summarize the question into a title

I will be travelling from Lahore to Abu Dhabi to Rome to Dallas to Manhattan KS. The flights are booked in a single ticket with my airline changing from Etihad to American Airlines in Rome. I wanted to know whether I'll go through pre-clearance in Abu Dhabi or will I have to go through Customs in Dallas?
Secondly, when will I have to recheck my baggage? Will it be when the airline changes in Rome?

Pre-clearance and Baggage

I will be arriving in Barcelona on the 13th of September and I will be staying together with my girlfriend for 6 nights.

Although I have a job, as students the budget is, let's say, a little limited. The hotel and the flight were already pretty expensive, so we would like to know if there are some places where we could eat a good lunch at an affordable price (10 euros, let's say).

First we will stay in El Guinardo neighborhood, and afterwards in La Vall D'Hebron. Nevertheless, the recommended places to eat can also be in nearby neighborhoods of the previously-mentioned ones or somewhere as "downtown" as possible.

If you think I can easily find affordable places to eat by just exploring the city, that also works for me.

I hope I don't sound cheap.

First time in Barcelona: affordable places to eat for a student

I have a 10 year tourist visa for the US and have been back and forth to the US for some years now visiting my partners family, she is American by birth.
We decided to get married after being together for 3 years.

Our intention is to go to the US in the summer, get married and celebrate with her family, and then come back to my home country where we both currently live permanently.

My question is, can we get married on the tourist visa if our intention is to return to our current country of residence?

I've had my own business for a long time here as well as other assets that can easily be proven to show that our intention is to return home, my partner has a job here and we stay together in an apartment that we rent and have a lease for, so lots of information to provide to the customs agent on arrival to show our intent is to marry and then leave to come back home.

Furthermore, we might decide to apply for a green card for myself in a few years time, but for this trip we have no intention of getting married and staying in the US and applying.

If anyone has some experience with this is would be greatly appreciated - thanks.
Getting married in the US on a Tourist Visa