SIL to be and hen weekend

[UC]

SIL-to-be is great, I enjoy her company, she's a lovely girl. She and DB are getting married next year, and I'm invited on the hen. It's in a city a long way from here (but do-able), but my main concern is the plan. To be honest, it's my worst nightmare of a weekend - I don't really drink and don't like techno music. She loves techno and has big plans for a massive night out to a club with loads of drinking involved. It just isn't me. I know this is a weekend that's about her, but I also know that I will be the one who's sober and dying to go home 4 hours (at least!!!) earlier than everyone else. The rest of the weekend sounds fab, shopping and a bit of relaxation. So I don't know what to do.

Do I go and suck it up? Or do I politely decline (but then feel really guilty), or do I go, but ask for a single room where we're staying, and just duck out of the bit I'm really dreading?

WWYD?

Go for the shopping and relaxation, and just explain that drinking isn't your thing and say you just haven't the stamina anymore.

I went on a hen weekend where people just ducked out of the bits they didn't fancy, and it was fine - everyone was happy and we had a fantastic time.

Thanks for that. I think I'll ask for a room by myself in the accommodation (realise that'll cost more), and explain that I'll duck out of the late night drinking/clubbing session that I'm dreading! I would so much rather do that than not go at all.

Not sure why I needed the validation of Mumsnet to get to this conclusion - but thanks TiAAAARGHo!