Here's a site for your Lithuanian beer - Svyturas Ekstra is my favourite, not forgetting Kiss Pear cider.
Here's the airport site with what you should be payting for your taxis. As you may get a rogue taxi driver, I suggest you go onto Google maps and work out the distance between your airport and your hotel and use that to work out a price and then agree on it before you set off
1 kilometer (from 6:00 to 22:00) 1,01 Eur
1 km at night (from 22:00 to 6:00) 1,16 Eur
1 km on weekends and holidays 1,16 Eur
1 km on motorway 1.16 Eur
Initial charge 1,45 Eur
1 min waiting time 0,29 Eu
A lot of the taxi drivers don't speak English so maybe a good idea to have the name of your hotel printed out.
Otherwise, you can pre book a taxi here.
If anyone is panning touristy stuff, I'd recommend KGB museum - quite harrowing though
I can suggests a few other things to do, other than pubs, for anyone over for more than just a couple of days. Just ask